I have a series of UIImageViews which are created in IB. I want to show and hide these depending on some button presses. I currently have a method which says if 1 is pressed then hide 2,3,4 then if 2 is pressed then hide 1,3,4. This works but I am trying to improve my code for an update.
My background is actionscript so I'm not sure if what I am trying to do is the right thing.
I basically want to evaluate a string reference to UIImageView, in AS I would use eval(string).
The method I am using is to create a string from a string and a number, so I get "image1". All works, but then I need to evaluate this into a UIImageView so I can update the alpha value.
Firstly is this possible and if not how should I be doing this? I'm starting to think that having this set up in interface builder maybe isn't helping?
That's probably not a good way to work. What you want is an array of imageViews. Then you just need a numeric index, and you can go through the array of imageViews hiding everything that doesn't have the chosen index.
But how do you get an array of imageViews? See How to make IBOutlets out of an array of objects? It explains how to use IBOutletCollection.
If you have a separate button for each view, put those into an IBOutletCollection too. That way you can have something like this:
- (IBAction) imageButtonPressed:(id) sender;
{
// The sender is the button that was just pressed.
NSUInteger chosenIndex = [[self imageButtons] objectAtIndex:sender];
for (NSUInteger imageIndex = 0; imageIndex < [[self imageViews] count]; imageIndex++)
{
// Hide all views other than the one associated with the pressed button.
if (imageIndex != chosenIndex)
{
[[[self imageViews] objectAtIndex:imageIndex] setHidden:YES];
}
else
{
[[[self imageViews] objectAtIndex:imageIndex] setHidden:NO];
}
}
}
If you really, really need to associate the string image1 with an imageView, you can construct an NSDictionary associating your controls with unique string identifiers for later lookup. NSDictionary is powerful, but I'm drawing a blank on reasons why this would be needed.
NSMutableDictionary *viewLookup;
[viewLookup setObject:[[self imageViews] objectAtIndex:0] forKey:#"image0"];
[viewLookup setObject:[[self imageViews] objectAtIndex:1] forKey:#"image1"];
[viewLookup setObject:[[self imageViews] objectAtIndex:2] forKey:#"image2"];
[viewLookup setObject:[[self imageButtons] objectAtIndex:0] forKey:#"button0"];
// ...
// Can now look up views by name.
// ...
NSString *viewName = #"image1";
UIView *viewFound = [viewLookup objectForKey:viewName];
[viewFound doSomething];
Related
This answer describes how to set the font, and thus the font color, of an NSMenuItem.
In order to alert the user to a problem with the selected item in a popup menu, I set the color to red. Works great, except when the item is highlighted, the background becomes blue, and my red-on-blue is hard to read and looks lousy. The font of regular menu items changes from black to white. I would like my modified menu item to change its font color when highlighted like that.
This is a dynamic menu. I set the font/color when items are created, in -menuNeedsUpdate. Of course, -[NSMenuItem isHighlighted] returns NO there because the item has just been created.
I also tried adding an observer on NSMenuDidBeginTrackingNotification and NSMenuDidBeginTrackingNotification, but that doesn't help either because these two notifications are always received in pairs, three to six pair each time I click the menu, and then after tracking has ended comes another -menuNeedsUpdate: which re-creates everything from scratch again. I'm not sure what it means when a menu is "tracking", but apparently it's not what I want.
I thought I'd ask if anyone has ever come up with a good answer for this, before I go off and do something really kludgey like these guys did for a similar NSMenuItem quandary.
You can implement the menu's delegate to be notified when an item is highlighted.
#pragma mark - NSMenuDelegate
- (void)menu:(NSMenu *)menu willHighlightItem:(NSMenuItem *)item {
[menu.highlightedItem nik_restoreTextColor];
[item nik_overrideTextColor:[NSColor selectedMenuItemTextColor]];
}
It should be pretty straightforward to remove and re-add the color of a single item.
But here's the generic solution I'm using to remember and later restore the color:
#implementation NSMutableAttributedString(NIKExchangeAttribute)
- (void)nik_renameAttribute:(NSString *)originalAttribute to:(NSString *)newAttribute {
NSRange fullRange = NSMakeRange(0, self.length);
[self removeAttribute:newAttribute range:fullRange];
[self enumerateAttribute:originalAttribute
inRange:fullRange
options:0
usingBlock:^(id value, NSRange range, BOOL *stop) {
[self addAttribute:newAttribute value:value range:range];
}];
[self removeAttribute:originalAttribute range:fullRange];
}
#end
static NSString *const ORIGINAL_COLOR_KEY = #"nik_originalColor";
#implementation NSMenuItem(NIKOverrideColor)
- (void)nik_overrideTextColor:(NSColor *)textColor {
NSMutableAttributedString *title = [self.attributedTitle mutableCopy];
[title nik_renameAttribute:NSForegroundColorAttributeName to:ORIGINAL_COLOR_KEY];
[title addAttribute:NSForegroundColorAttributeName
value:textColor
range:NSMakeRange(0, title.length)];
self.attributedTitle = title;
}
- (void)nik_restoreTextColor {
NSMutableAttributedString *title = [self.attributedTitle mutableCopy];
[title nik_renameAttribute:ORIGINAL_COLOR_KEY to:NSForegroundColorAttributeName];
self.attributedTitle = title;
}
#end
i created a image view
for(int i=0; i<pcount; i++)
{
int x = rand() % 350;
int y = rand() % 350;
NSRect rect = NSMakeRect((x+10),(y+10), 200, 200);
//NSImageView *imageView
imageView1 = [[NSImageView alloc]initWithFrame:rect];
[imageView1 setTag:i];
// imageView = [[NSImageView alloc]initWithFrame:rect];
// [imageView1 rotateByAngle:rand() % 150];
[imageView1 setImageScaling:NSScaleToFit];
[imageView1 canBecomeKeyView];
NSImage *theImage = [[NSImage alloc]initWithContentsOfURL:(NSURL*)[patharray objectAtIndex:(i)]];
[imageView1 setImage:theImage];
[[imageView1 cell] setHighlighted:YES];
[[layoutCustom view] addSubview:imageView1 positioned:NSWindowMovedEventType relativeTo:nil];}
now how can select each image view by mouse click ? thanks in advance.
I'm assuming here that you have your reasons for not using existing collection views. So from what I read in your code you have layoutCustom.view, which contains a bunch of NSImageViews. Here are two options:
In your layoutCustom object implement the mouseDown: (or mouseUp: or both). Take the event location convert it view coordinates and look for any subview for which CGRectContainsPoint(subview.frame, mouseDownPoint) return YES. You should select that view.
Subclass NSImageView and implement mouseDown: (or mouseUp: or both). On mouseDown: simply set a "selected" flag. Either the view can draw something itself when selected or the layoutCustom object can observe the property and draw the selection accordingly.
I would prefer option 1 because it simpler, requires fewer classes and fewer interactions between objects.
// Option 1 (in layoutCustom class)
- (void) mouseDown:(NSEvent*)theEvent {
CGPoint mouseDownPoint = [self convertPoint:theEvent.locationInWindow fromView:nil];
for (NSView *view in self.subviews) {
if (CGRectContainsPoint(view.frame, mouseDownPoint)) {
// Do something to remember the selection.
// Draw the selection in drawRect:
[self setNeedsDisplay:YES];
}
}
}
// Option 2 (in Custom subclass of NSImage)
- (void) mouseDown:(NSEvent*)theEvent {
self.selected = !self.selected;
}
// Option 2 (in layoutCustom class)
- (void) addSubview:(NSView*)view positioned:(NSWindowOrderingMode)place relativeTo:(NSView*)otherView {
[super addSubview:view positioned:place relativeTo:otherView];
[self startObservingSubview:view];
}
- (void) willRemoveSubview:(NSView*)view {
[self stopObservingSubview:view];
}
- (void) startObservingSubview:(NSView*)view {
// Register your KVO here
// You MUST implement observeValueForKeyPath:ofObject:change:context:
}
- (void) stopObservingSubview:(NSView*)view {
// Remove your KVO here
}
I've got a better idea: Instead of fighting with converting mouse clicks in a view to coordinates and then figuring out how to map it to the right subview or sub-image, why not have one big (or scrolling?) view and then add your images as giant "NSButton" objects (set to custom type), where the button images can be the images you want to add.
As for how to select each image? You can either subclass "NSButton" and keep track of some custom data within it, or you can use a "tag" to figure out which button was pressed in your "IBAction" method and then decide what to do with it.
Another approach might be to embed your images into NSTableView cells...
I am developing my first MAC application, i downloaded one Example of PxListView
and i have to added one button and background image on cell xib and bind them with controller
and, when on button click i was set height of that cell is much bigger then other. that is done,
and work fine.
but now i want to develop like after is witch cell has open in that cell i want to add some extra contain (Controller) on it, so how it will possible using given example?
pls help me to give some suggest how it will be done.
for Ex like before click on button
after chick on button i want to develop like
You write
i have to added one button and background image on cell xib and bind them with controller
It sounds like you've subclassed PXListViewCell--for convenience, let's call your subclass TemplateListViewCell--and added a xib from which instances of TemplateListViewCell will be loaded in
+[PXListViewCell cellLoadedFromNibNamed:bundle:reusableIdentifier:]
In addition, there is a[t least one] button in TemplateListViewCell.xib.
You write
when on button click i was set height of that cell is much bigger then other. that is done, and work fine
It sounds like this button has as its action a method on TemplateListViewCell such as
- (IBAction)toggleDetail:(id)sender
{
//Code to grow or shrink the height of [self frame].
//...
}
In my approach to implementing -toggleDetail, two modifications to the PXListView files were necessary:
1. Adding a protocol method
- (void)listView:(PXListView *)aListView setHeight:(CGFloat)height ofRow:(NSUInteger)row;
to the PXListViewDelegate protocol.
2. Adding a property
#property (nonatomic, assign) BOOL expanded;
to PXListViewCell.
My implementation of -toggleDetail looks something like this:
- (IBAction)toggleDetail:(id)sender
{
BOOL wasExpanded = [self expanded];
NSRect oldFrame = [self frame];
CGFloat oldHeight = oldFrame.size.height;
CGFloat newHeight = oldHeight;
CGFloat heightIncrement = 0.0f;
if (wasExpanded) {
heightIncrement = -80.0f; //use whatever value is appropriate
} else {
heightIncrement = 80.0f; //use whatever value is appropriate
}
newHeight += heightIncrement;
[[[self listView] delegate] listView:[self listView] setHeight:newHeight ofRow:[self row]];
[[self listView] reloadData];
BOOL isExpanded = !wasExpanded;
[self setExpanded:isExpanded];
}
It might seem better to use [[self listView] reloadRowAtIndex:[self row]]; in place of [[self listView] reloadData], but unfortunately, this doesn't work: if the user hides the detail--shrinks the cell vertically--new cells which should appear on the screen do not.
You write
that is done, and work fine.
It sounds like you were able to implement successfully a method analogous to -[TemplateListViewCell toggleDetail:].
You write
but now i want to develop like after is witch cell has open in that cell i want to add some extra contain (Controller) on it, so how it will possible using given example? pls help me to give some suggest how it will be done.
It sounds like you want instances of TemplateListViewCell to contain extra views if they are expanded.
It might seem tempting to put this code into -[TemplateListViewCell toggleDetail], but this will not work out as we might hope. The trouble is, we need to handle cases where expanded cells have been scrolled out of view and scrolled back into view.
To get this right, we need to have a notion of expanded which persists beyond the usage of a PXListViewCell subclass instance: we either need to keep track of expansion in the PXListView itself or in its delegate.
The better--but less expedient--design seems to be to keep track of this information in the PXListView itself. For the sake of this question, however, I'll demonstrate how to keep track of cell expansion in the delegate. To do this, I'm expanding the PXListViewDelegate protocol and making other changes to the PXListView files:
1. Adding the methods
- (void)listView:(PXListView *)aListView setExpanded:(BOOL)expanded atRow:(NSUInteger)row;
- (BOOL)listView:(PXListView *)aListView expandedAtRow:(NSUInteger)row;
to PXListViewDelegate.
2. Adding the method
- (void)setCell:(PXListViewCell *)cell expandedAtRow:(NSUInteger)row
{
if ([[self delegate] respondsToSelector:#selector(listView:expandedAtRow:)]) {
[cell setExpanded:[[self delegate] listView:self expandedAtRow:row]];
}
}
to PXListView.
3. Calling -[PXListView setCell:expandedAtRow:] from -[PXListView layoutCells]
- (void)layoutCells
{
//Set the frames of the cells
for(id cell in _visibleCells)
{
NSInteger row = [cell row];
[cell setFrame:[self rectOfRow:row]];
[self setCell:cell expandedAtRow:row];
[cell layoutSubviews];
}
NSRect bounds = [self bounds];
CGFloat documentHeight = _totalHeight>NSHeight(bounds)?_totalHeight:(NSHeight(bounds) -2);
//Set the new height of the document view
[[self documentView] setFrame:NSMakeRect(0.0f, 0.0f, NSWidth([self contentViewRect]), documentHeight)];
}
and from -[PXListView layoutCell:atRow:]:
- (void)layoutCell:(PXListViewCell*)cell atRow:(NSUInteger)row
{
[[self documentView] addSubview:cell];
[cell setFrame:[self rectOfRow:row]];
[cell setListView:self];
[cell setRow:row];
[cell setHidden:NO];
[self setCell:cell expandedAtRow:row];
}
4. Setting _expanded to NO in -[PXListViewCell prepareForReuse]:
- (void)prepareForReuse
{
_dropHighlight = PXListViewDropNowhere;
_expanded = NO;
}
Note: In the sample PXListViewCell subclass, MyListViewCell, distributed with PXListView, the implementation of -[MyListViewCell prepareForReuse] fails to call [super prepareForReuse]. Make sure that this call is made in [TemplateListViewCell prepareForReuse]:
- (void)prepareForReuse
{
//...
[super prepareForReuse];
}
One change needs to be made to -[TemplateListViewCell toggleDetail:]. The line
[self setExpanded:isExpanded];
needs to be replaced by
[[[self listView] delegate] listView:[self listView] setExpanded:isExpanded atRow:[self row]];
Once you've set up your PXListView's delegate to properly handle the new delegate methods, you're ready to override [PXListViewCell setExpanded:] in your subclass TemplateListViewCell:
- (void)setExpanded:(BOOL)expanded
{
if (expanded) {
//add detail subviews
} else {
//remove detail subviews
}
[super setExpanded:expanded];
}
Replace //add detail subviews with your own code which programmatically adds the detail subviews that you want and replace //remove detail subviews with code to remove the detail subviews that you want, checking to see that they are present first.
You write
i want to add some extra contain (Controller) on it
It sounds like you want to add view controllers rather than views to your TemplateListViewCell. To do this, use an NSBox and set the box's contentView to your view controller's view. (For details on this, see this answer.)
If you plan on just showing a single view controller's view in an NSBox on the expanded TemplateListViewCell, you can just (1) add a property to TemplateListViewCell referencing your view controller and (2) add an NSBox to TemplateListViewCell xib and set its contentView to the appropriate view controller's view on [cell setExpanded:YES] and set its contentView to nil on [cell setExpanded:NO].
I've a NSPopupButton and I want it so resize itself to fit the selected title.
[NSPopupButton sizeToFit] doesn't fit my needs because the popup is resized to the largest title item not to the current selected one
I've tried in may ways without success the closer is
#define ARROW_WIDTH 20
NSDictionary *displayAttributes = [NSDictionary dictionaryWithObjectsAndKeys:[popup font], NSFontAttributeName, nil];
NSSize titleSize = [popup.titleOfSelectedItem sizeWithAttributes:displayAttributes] + ARROW_WIDTH;
But the constant value ARROW_WIDTH is a really dirty and error prone solution.
TextWrangler encoding combo on status bar works like I need
The way I've handled these problems with text fields is to try the resizing with a text field that you never add to the view hierarchy. You call sizeToFit on an object that you have no intention of reusing, then use that to figure out how wide your actual control needs to be to fit what you need to do.
So, in pseudo code, you'd do this (assuming you're using ARC, YMMV for non-ARC projects as this will leak):
NSArray *popupTitle = [NSArray arrayWithObject: title];
NSPopUpButton *invisiblePopup = [[NSPopUpButton alloc] initWithFrame: CGRectZero pullsDown: YES];
// Note that you may have to set the pullsDown bool to whatever it is with your actual popup button.
[invisiblePopup addItemWithTitle: #"selected title here"];
[invisiblePopup sizeToFit];
CGRect requiredFrame = [invisiblePopup frame];
self.actualPopup.frame = requiredFrame;
For projects with autolayout override method intrinsicContentSize in subclass of NSPopUpButton
class NNPopUpButton: NSPopUpButton {
override var intrinsicContentSize: NSSize {
let fakePopUpButton = NSPopUpButton(frame: NSZeroRect, pullsDown: false)
fakePopUpButton.addItem(withTitle: title)
fakePopUpButton.sizeToFit()
var requiredFrame = fakePopUpButton.frame
requiredFrame.size.width -= 35 // reserved space for key equivalent
return requiredFrame.size
}
}
Got a ABPeoplePickerNavigationController and after its displayed I want to search through the cells and find the text i.e. user names displayed. I then want to check the users if they are contained in a coredata NSSet... My issue, I can't seem to get the text back from the cells just Null. I know the cells are the correct ones as I can happily play with the cell accessory type. Sample code shown:
[self presentViewController:picker animated:YES completion:^{
// Find the picker tableViewController
UIView *view = picker.topViewController.view;
UITableView *tableView = nil;
for(UIView *uv in view.subviews)
{
if([uv isKindOfClass:[UITableView class]])
{
tableView = (UITableView*)uv;
break;
}
}
// Check tableView not Null then Loop occurs here with this code in it always giving me Null
// I know the tables populated and displayed at this point so why Null ?
.......
NSString *a = [[[tableView cellForRowAtIndexPath:[NSIndexPath indexPathForItem:0 inSection:x]] detailTextLabel] text];
.......
}];
Starting to think this could be related to ios6 privacy controls ?