I've subclassed a NSTextFieldCell (inside a NSTableView) to draw a custom foreground color when a cell (ie row) is selected (eg isHighlighted is true) and everything works fine.
The problem is when the table view loses the focus I want to draw the selected rows with a different color, how can I determine if the table view containing the cell isn't the first responder inside drawWithFrame:(NSRect)cellFrame inView:(NSView*)controlView?
My current code is
- (void)drawWithFrame:(NSRect)cellFrame inView:(NSView*)controlView {
NSColor* textColor = [self isHighlighted]
? [NSColor alternateSelectedControlTextColor]
: [NSColor darkGrayColor];
}
The best way I've found that doesn't make you deal with responders (since sometimes the controlView's superview is the responder or some nonsense) is to use the editor:
BOOL isEditing = [(NSTextField *)[self controlView] currentEditor] != nil;
Easy as that!
I've found a solution that uses the firstResponder, it is simple and seems efficient
- (void)drawWithFrame:(NSRect)cellFrame inView:(NSView*)controlView {
NSColor* textColor;
if ([self isHighlighted]) {
textColor = [[controlView window] firstResponder] == controlView
? [NSColor alternateSelectedControlTextColor]
: [NSColor yellowColor];
} else {
textColor = [NSColor darkGrayColor];
}
// use textColor
...
...
[super drawWithFrame:cellFrame inView:controlView];
}
one more thing, the above code is perfect, however if you have multiple windows
you will need to check if your window is key
if (controlView && ([[controlView window] firstResponder] == controlView) && [[controlView window] isKeyWindow]) {
[attributes setObject:[NSColor whiteColor] forKey:NSForegroundColorAttributeName];
}
Related
I created a custom NSTextFieldCell and overwrote - (void)drawInteriorWithFrame: (NSRect)cellFrame inView: (NSView *)controlView to do my own drawing here. However, I have trouble with background drawing. Without calling super the background is not cleared and subsequent drawings create something like a smear effect. This does not happen when drawsBackground is set, as in this case I can just fill the cellFrame with the background color.
- (void)drawInteriorWithFrame: (NSRect)cellFrame inView: (NSView *)controlView {
if (self.drawsBackground) {
[self.backgroundColor set];
} else {
[NSColor.clearColor set];
}
NSRectFill(cellFrame);
[self.attributedStringValue drawInRect: cellFrame];
}
But what do I have to do to clear the background in case background drawing is disabled? I want to let the other content under the text view to shine through of course (so, just erasing with the superview's background color is no solution).
If you try to fill the cell with a [NSColor clearColor] it will draw it Black.
Try to avoid the Fill when it is not needed. And you will be able to remove your super call.
Example:
- (void)drawInteriorWithFrame:(NSRect)cellFrame inView:(NSView *)controlView
{
if (self.drawsBackground) {
if (self.backgroundColor && self.backgroundColor.alphaComponent>0) {
[self.backgroundColor set];
NSRectFill(cellFrame);
}
}
NSRect titleRect = [self titleRectForBounds:cellFrame];
NSAttributedString *aTitle = [self attributedStringValue];
if ([aTitle length] > 0) {
[aTitle drawInRect:titleRect];
}
}
I am trying to create a Cocoa UI that consists of two sets of squares (chess-like grids) that will assume different colours while an underlying algorithm is running. When the execution of the algorithm comes to an end, the UI should be able to handle clicks, panning and other gestures.
The hierarchy I have so far is the following (please check the attached code for specifics):
1) the main window that is the window of a window controller
2) a split view with two custom views, mainView and sideView (each one would hold a set of squares)
3) two view controllers (mainViewController and sideViewController)
I would like to be able to load the squares as subviews of mainView and sideView.
I thought of having another custom view, say SquareView with another nib file. My questions would be:
a) how do I create this SquareView so that it can be used to create the squares that will be added to mainView and sideView as subviews to form chess-like grids?
b) how do I add subviews to mainView and sideView to built the two grids? For the sake of simplicity, let's assume there would be four non-overlapping squares for each of the previously mentioned views.
Thank you!
MainView.m
#import "MainView.h"
#implementation MainView
- (void)drawRect:(NSRect)TheRect
{
[[NSColor grayColor] set];
[NSBezierPath fillRect:[self bounds]];
}
SideView.m
#import "SideView.h"
#implementation MainView
- (void)drawRect:(NSRect)TheRect
{
[[NSColor whiteColor] set];
[NSBezierPath fillRect:[self bounds]];
}
MainWindowController.h
#import <Cocoa/Cocoa.h>
#class SideViewController;
#class MainViewController;
#interface MainWindowController : NSWindowController
{
IBOutlet NSSplitView* oMainSplitView;
SideViewController* sideViewController;
MainViewController* mainViewController;
}
#end
MainWindowController.m
#import "MainWindowController.h"
#import "SideViewController.h"
#import "MainViewController.h"
#implementation MainWindowController
- (void)windowDidLoad
{
sideViewController = [[SideViewController alloc] initWithNibName:#"SideView" bundle:nil];
NSView* splitViewLeftView = [[oMainSplitView subviews] objectAtIndex:0];
NSView* sideView = [sideViewController view];
[sideView setFrame:[splitViewLeftView bounds]];
[sideView setAutoresizingMask:(NSViewWidthSizable | NSViewHeightSizable)];
[splitViewLeftView addSubview:sideView];
mainViewController = [[MainViewController alloc] initWithNibName:#"MainView" bundle:nil];
NSView* splitViewRightView = [[oMainSplitView subviews] objectAtIndex:1];
NSView* mainView = [mainViewController view];
[mainView setFrame:[splitViewRightView bounds]];
[mainView setAutoresizingMask:(NSViewWidthSizable | NSViewHeightSizable)];
[splitViewRightView addSubview:mainView];
}
You can make this as simple or as complicated as you desire: simple? do everything you want in MainView's drawRect method; complex: nest NSViews (or NSCell's, or NSBox's, etc.) and have each one draw itself.
Personally, I'd vote to keep it simple…
a) I think the easiest way would be to create a matrix of NSBoxes, which you could do in code or in IB. Having the squares in a matrix would make it easy to loop through them or access specific ones.
b) I'm not sure what your question is here -- you would do it just as you did in your posted code, using [mainView addSubview:squareMatrix];
After Edit: Actually, it looks like IB won't let you embed NSBoxes in a matrix. In the past, I've made a matrix of subclassed NSButtonCells (to allow background color with no border) that had a grid of 64x64 cells that were clickable and would change color with those clicks. I don't know if you want a fixed number of cells in your views, or do you need to dynamically change the number? Something like this could work for you I think -- I actually created this in code, because IB was really slow in updating with that many cells.
Here is what I did. In my case, I needed cells with no border but with background color, so I had to subclass NSButtonCell, like this:
-(id)initWithRGBAlpha:(NSArray *)rgbAlpha {
if (self == [super init]) {
NSColor *color = [NSColor colorWithCalibratedRed:[[rgbAlpha objectAtIndex:0]doubleValue]
green:[[rgbAlpha objectAtIndex:1]doubleValue]
blue:[[rgbAlpha objectAtIndex:2]doubleValue]
alpha:[[rgbAlpha objectAtIndex:3]doubleValue]];
[self setBackgroundColor:color];
[self setTitle:#""];
[self setBordered:NO];
[self setTag:0];
[self setImageScaling:3];
return self;
}else{
return nil;
}
}
-(void) setState:(NSInteger)value {
if (value == 1) {
self.backgroundColor = self.selectedColor;
[super setState:value];
}else {
self.backgroundColor = self.backgroundColor;
[super setState:value];
}
}
-(void) setBackgroundColor:(NSColor *)color {
backgroundColor = color;
selectedColor = [color colorWithAlphaComponent:.75];
}
- (void)encodeWithCoder:(NSCoder *)encoder {
[super encodeWithCoder:encoder];
[encoder encodeObject:self.backgroundColor forKey:#"bColor"];
}
- (id)initWithCoder:(NSCoder *)decoder {
[super initWithCoder:decoder];
self.backgroundColor = [decoder decodeObjectForKey:#"bColor"];
return self;
}
I created the matrix in code, like so:
#implementation RDMatrix
-(void) initWithParentView:(NSView *) cv {
NSNumber *one = [NSNumber numberWithInt:1];
NSArray *colors = [NSArray arrayWithObjects:one,one,one,one,nil];
RDButtonCell *theCell = [[RDButtonCell alloc ]initWithRGBAlpha:colors];
[self initWithFrame:NSMakeRect(200,100,1,1) mode:2 prototype:theCell numberOfRows:64 numberOfColumns:64];
[self setSelectionByRect:TRUE];
[self setCellSize:NSMakeSize(8,8)];
[self sizeToCells];
self.target = self;
self.action = #selector(matrixClick:);
self.backgroundColor = [NSColor lightGrayColor];
self.drawsBackground = TRUE;
self.autoresizingMask = 8;
self.allowsEmptySelection = TRUE;
[cv addSubview:self];
}
-(void) matrixClick: (id) sender {
for (RDButtonCell *aCell in self.selectedCells){
if ([self.selectedCells count] < 64) {
aCell.backgroundColor = [NSColor colorWithCalibratedRed:1 green:0 blue:0 alpha:1];
}else{
aCell.backgroundColor = [NSColor colorWithCalibratedRed:0 green:.5 blue:1 alpha:1];
}
}
[self deselectAllCells];
}
#end
I have a view based NSTableView with a custom NSTableCellView. This custom NSTableCellView has several labels (NSTextField). The whole UI of the NSTableCellView is built in IB.
The NSTableCellView can be in a normal state and in a selected state. In the normal state all text labels should be black, in the selected state they should be white.
How can I manage this?
Override setBackgroundStyle: on the NSTableCellView to know when the background changes which is what affects what text color you should use in your cell.
For instance:
- (void)setBackgroundStyle:(NSBackgroundStyle)style
{
[super setBackgroundStyle:style];
// If the cell's text color is black, this sets it to white
[((NSCell *)self.descriptionField.cell) setBackgroundStyle:style];
// Otherwise you need to change the color manually
switch (style) {
case NSBackgroundStyleLight:
[self.descriptionField setTextColor:[NSColor colorWithCalibratedWhite:0.4 alpha:1.0]];
break;
case NSBackgroundStyleDark:
default:
[self.descriptionField setTextColor:[NSColor colorWithCalibratedWhite:1.0 alpha:1.0]];
break;
}
}
In source list table views the cell view's background style is set to Light, as is its textField's backgroundStyle, however the textField also draws a shadow under its text and haven't yet found exactly what is controlling that / determining that should it happen.
Probably the easiest way to accomplish this would be to subclass NSTextField and to override the drawRect: method in your subclass. There you can determine whether the NSTableCellView instance containing your NSTextField instances is currently selected by using this code (which I use with a NSOutlineView, but it should also work with NSTableView):
BOOL selected = NO;
id tableView = [[[self superview] superview] superview];
if ([tableView isKindOfClass:[NSTableView class]]) {
NSInteger row = [tableView selectedRow];
if (row != -1) {
id cellView = [tableView viewAtColumn:0 row:row makeIfNecessary:YES];
if ([cellView isEqualTo:[self superview]]) selected = YES;
}
}
Then draw the view like this:
if (selected) {
// set your color here
// draw [self stringValue] here in [self bounds]
} else {
// call [super drawRect]
}
This works no matter what style the table view has:
- (void)setBackgroundStyle:(NSBackgroundStyle)backgroundStyle {
[super setBackgroundStyle:backgroundStyle];
NSTableView *tableView = self.enclosingScrollView.documentView;
BOOL tableViewIsFirstResponder = [tableView isEqual:[self.window firstResponder]];
NSColor *color = nil;
if(backgroundStyle == NSBackgroundStyleLight) {
color = tableViewIsFirstResponder ? [NSColor lightGrayColor] : [NSColor darkGrayColor];
} else {
color = [NSColor whiteColor];
}
myTextField.textColor = color;
}
Swift 4
override var backgroundStyle: NSView.BackgroundStyle {
get {
return super.backgroundStyle
}
set {
self.yourCustomLabel.textColor = NSColor(calibratedWhite: 0.0, alpha: 1.0)//black
}
}
UIBarButtonItem does not extend UIView, so there is nothing like a frame property.
But is there any way I can get what is it's CGRect frame, relative to the application UIWindow?
Do you like to use private APIs? If yes,
UIView* view = thatItem.view;
return [view convertRect:view.bounds toView:nil];
Of course no one wants this when targeting the AppStore. A more unreliable method, and also uses undocumented features, but will pass Apple's test, is to loop through the subviews to look for the corresponding button item.
NSMutableArray* buttons = [[NSMutableArray alloc] init];
for (UIControl* btn in theToolbarOrNavbar.subviews)
if ([btn isKindOfClass:[UIControl class]])
[buttons addObject:btn];
UIView* view = [buttons objectAtIndex:index];
[buttons release];
return [view convertRect:view.bounds toView:nil];
The index is the index to your bar item in the array of .items, after removing all blank items. This assumes the buttons are arranged in increasing order, which may not be. A more reliable method is to sort the buttons array in increasing .origin.x value. Of course this still assumes the bar button item must inherit the UIControl class, and are direct subviews of the toolbar/nav-bar, which again may not be.
As you can see, there are a lot of uncertainty when dealing with undocumented features. However, you just want to pop up something under the finger right? The UIBarButtonItem's .action can be a selector of the form:
-(void)buttonClicked:(UIBarButtonItem*)sender event:(UIEvent*)event;
note the event argument — you can obtain the position of touch with
[[event.allTouches anyObject] locationInView:theWindow]
or the button view with
[[event.allTouches anyObject] view]
Therefore, there's no need to iterate the subviews or use undocumented features for what you want to do.
I didn't see this option posted (which in my opinion is much simpler), so here it is:
UIView *barButtonView = [barButtonItem valueForKey:#"view"];
In iOS 3.2, there's a much easier way to show an Action Sheet popover from a toolbar button. Merely do something like this:
- (IBAction)buttonClicked:(UIBarButtonItem *)sender event:(UIEvent *)event
{
UIActionSheet *popupSheet;
// Prepare your action sheet
[popupSheet showFromBarButtonItem:sender animated:YES];
}
This is the implementation I use for my WEPopover project: (https://github.com/werner77/WEPopover):
#implementation UIBarButtonItem(WEPopover)
- (CGRect)frameInView:(UIView *)v {
UIView *theView = self.customView;
if (!theView.superview && [self respondsToSelector:#selector(view)]) {
theView = [self performSelector:#selector(view)];
}
UIView *parentView = theView.superview;
NSArray *subviews = parentView.subviews;
NSUInteger indexOfView = [subviews indexOfObject:theView];
NSUInteger subviewCount = subviews.count;
if (subviewCount > 0 && indexOfView != NSNotFound) {
UIView *button = [parentView.subviews objectAtIndex:indexOfView];
return [button convertRect:button.bounds toView:v];
} else {
return CGRectZero;
}
}
#end
As long as UIBarButtonItem (and UITabBarItem) does not inherit from UIView—for historical reasons UIBarItem inherits from NSObject—this craziness continues (as of this writing, iOS 8.2 and counting ... )
The best answer in this thread is obviously #KennyTM's. Don't be silly and use the private API to find the view.
Here's a oneline Swift solution to get an origin.x sorted array (like Kenny's answer suggests):
let buttonFrames = myToolbar.subviews.filter({
$0 is UIControl
}).sorted({
$0.frame.origin.x < $1.frame.origin.x
}).map({
$0.convertRect($0.bounds, toView:nil)
})
The array is now origin.x sorted with the UIBarButtonItem frames.
(If you feel the need to read more about other people's struggles with UIBarButtonItem, I recommend Ash Furrow's blog post from 2012: Exploring UIBarButtonItem)
I was able to get Werner Altewischer's WEpopover to work by passing up the toolbar along with the
UIBarButton:
Mod is in WEPopoverController.m
- (void)presentPopoverFromBarButtonItem:(UIBarButtonItem *)item toolBar:(UIToolbar *)toolBar
permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections
animated:(BOOL)animated
{
self.currentUIControl = nil;
self.currentView = nil;
self.currentBarButtonItem = item;
self.currentArrowDirections = arrowDirections;
self.currentToolBar = toolBar;
UIView *v = [self keyView];
UIButton *button = nil;
for (UIView *subview in toolBar.subviews)
{
if ([[subview class].description isEqualToString:#"UIToolbarButton"])
{
for (id target in [(UIButton *)subview allTargets])
{
if (target == item)
{
button = (UIButton *)subview;
break;
}
}
if (button != nil) break;
}
}
CGRect rect = [button.superview convertRect:button.frame toView:v];
[self presentPopoverFromRect:rect inView:v permittedArrowDirections:arrowDirections animated:animated];
}
-(CGRect) getBarItemRc :(UIBarButtonItem *)item{
UIView *view = [item valueForKey:#"view"];
return [view frame];
}
You can get it from the UINavigationBar view. The navigationBar is a UIView which has 2 or 3 custom subviews for the parts on the bar.
If you know that the UIBarButtonItem is currently shown in the navbar on the right, you can get its frame from navbar's subviews array.
First you need the navigationBar which you can get from the navigationController which you can get from the UIViewController. Then find the right most subview:
UINavigationBar* navbar = curViewController.navigationController.navigationBar;
UIView* rightView = nil;
for (UIView* v in navbar.subviews) {
if (rightView==nil) {
rightView = v;
} else if (v.frame.origin.x > rightView.frame.origin.x) {
rightView = v; // this view is further right
}
}
// at this point rightView contains the right most subview of the navbar
I haven't compiled this code so YMMV.
This is not the best solution and from some point of view it's not right solution and we can't do like follow because we access to object inside UIBarBattonItem implicitly, but you can try to do something like:
UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 30, 30)];
[button setImage:[UIImage imageNamed:#"Menu_Icon"] forState:UIControlStateNormal];
[button addTarget:self action:#selector(didPressitem) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithCustomView:button];
self.navigationItem.rightBarButtonItem = item;
CGPoint point = [self.view convertPoint:button.center fromView:(UIView *)self.navigationItem.rightBarButtonItem];
//this is like view because we use UIButton like "base" obj for
//UIBarButtonItem, but u should note that UIBarButtonItem base class
//is NSObject class not UIView class, for hiding warning we implicity
//cast UIBarButtonItem created with UIButton to UIView
NSLog(#"point %#", NSStringFromCGPoint(point));
as result i got next:
point {289, 22}
Before implement this code, be sure to call [window makeKeyAndVisible] in your Applition delegate application:didFinishLaunchingWithOptions: method!
- (void) someMethod
{
CGRect rect = [barButtonItem convertRect:barButtonItem.customview.bounds toView:[self keyView]];
}
- (UIView *)keyView {
UIWindow *w = [[UIApplication sharedApplication] keyWindow];
if (w.subviews.count > 0) {
return [w.subviews objectAtIndex:0];
} else {
return w;
}
}
I handled it as follows:
- (IBAction)buttonClicked:(UIBarButtonItem *)sender event:(UIEvent *)event
{
UIView* view = [sender valueForKey:#"view"]; //use KVO to return the view
CGRect rect = [view convertRect:view.bounds toView:self.view];
//do stuff with the rect
}
Greetings all,
I am a noob and I have been trying to work through this for a few days.
I am adding images to a view via UItouch. The view contains a background on top of which the new images are add. How do I clear the images I am adding from the subview, without getting rid of the UIImage that is the background. Any assistance is greatly appreciated. Thanks in Advance.
here is the code:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *) event {
NSUInteger numTaps = [[touches anyObject] tapCount];
if (numTaps==2) {
imageCounter.text =#"two taps registered";
//__ remove images
UIView* subview;
while ((subview = [[self.view subviews] lastObject]) != nil)
[subview removeFromSuperview];
return;
}else {
UITouch *touch = [touches anyObject];
CGPoint touchPoint = [touch locationInView:self.view];
CGRect myImageRect = CGRectMake((touchPoint.x -40), (touchPoint.y -45), 80.0f, 90.0f);
UIImageView *myImage = [[UIImageView alloc] initWithFrame:myImageRect];
[myImage setImage:[UIImage imageNamed:#"pg6_dog_button.png"]];
myImage.opaque = YES; // explicitly opaque for performance
[self.view addSubview:myImage];
[myImage release];
[imagesArray addObject:myImage];
NSNumber *arrayCount =[self.view.subviews count];
viewArrayCount.text =[NSString stringWithFormat:#"%d",arrayCount];
imageCount=imageCount++;
imageCounter.text =[NSString stringWithFormat:#"%d",imageCount];
}
}
What you need is a way of distinguishing the added UIImageView objects from the background UIImageView. There are two ways I can think of to do this.
Approach 1: Assign added UIImageView objects a special tag value
Each UIView object has a tag property which is simply an integer value that can be used to identify that view. You could set the tag value of each added view to 7 like this:
myImage.tag = 7;
Then, to remove the added views, you could step through all of the subviews and only remove the ones with a tag value of 7:
for (UIView *subview in [self.view subviews]) {
if (subview.tag == 7) {
[subview removeFromSuperview];
}
}
Approach 2: Remember the background view
Another approach is to keep a reference to the background view so you can distinguish it from the added views. Make an IBOutlet for the background UIImageView and assign it the usual way in Interface Builder. Then, before removing a subview, just make sure it's not the background view.
for (UIView *subview in [self.view subviews]) {
if (subview != self.backgroundImageView) {
[subview removeFromSuperview];
}
}
A more swiftly code for approach #1 in only one functional line of code :
self.view.subviews.filter({$0.tag == 7}).forEach({$0.removeFromSuperview()})