i create a scrollview in a split view's top view in Interaface Build, i want to keep my document view always on the top of the top view, when i collapse the split view, the document view always on the bottom of the top view. any suggesstions?
Use the constraint to handle this, or just in the -[viewWillAppear:], your parent view reposition the scrollview.
i have go the answer.
- (BOOL) isFlipped
{
return YES;
}
Related
I am using auto layout with Storyboard. I present a popoverPresentationController from a cell rect:
NumberController * viewController = [self.storyboard instantiateViewControllerWithIdentifier:#"NumberController"];
UIPopoverPresentationController *pc = [viewController popoverPresentationController];
pc.delegate = self;
pc.permittedArrowDirections = UIPopoverArrowDirectionAny;
pc.sourceView = tableView;
pc.sourceRect = [tableView rectForRowAtIndexPath:indexPath];
[self.navigationController presentViewController:viewController animated:animated completion:nil];
The popover presents on an iPad in portrait mode with the arrow up.
I rotate the iPad to landscape mode. The popoverPresentationController keeps the same sourceView/sourceRect and properly points to the cell. It also keeps the up arrow.
But it is now at the bottom of the view, so the popover resizes to a shorter height. This is not desired behavior.
If the popover were simply to move to a new position and change the arrow direction, it would not need to resize at all. This is the desired behavior.
I thought the following method might permit me to make changes, but it is not called since the sourceView rect does not change:
- (void)popoverController:(UIPopoverController *)popoverController
willRepositionPopoverToRect:(inout CGRect *)rect
inView:(inout UIView **)view {
}
I have tried to reset the permittedArrowDirections (in preferredContentSize, because this seemed like the most logical place). This does not work (the popover still resizes):
- (CGSize) preferredContentSize {
[super preferredContentSize];
self.popoverPresentationController.permittedArrowDirections = UIPopoverArrowDirectionUnknown;
return CGSizeMake(DEFAULT_POPOVER_WIDTH,DEFAULT_POPOVER_HEIGHT);
}
I simply cannot find a way to force the popoverPresentationController to change arrow direction and reposition the popover instead of resizing the popover. I am beginning to think it is not even possible - but I still hold out hope that I am just missing something.
EDIT: In the meantime, it has occurred to me that maybe a popover is not the best way to present this view if I don't want it resized in iPad. I am going to try it with UIModalPresentationFormSheet presentation. But I would still like to find an answer to this question.
I just ran into the problem where
- (void)popoverController:(UIPopoverController *)popoverController
willRepositionPopoverToRect:(inout CGRect *)rect
inView:(inout UIView **)view {
was not being called because my view controller was detached. There may be a view in your view hierarchy whose view controller has not been added as a child view controller.
I thought the following method might permit me to make changes, but it is not called since the sourceView rect does not change
The sourceView rect does not have to change, just the interface orientation. From the UIPopoverControllerDelegate documentation:
For popovers that were presented using the presentPopoverFromRect:inView:permittedArrowDirections:animated: method, the popover controller calls this method when the interface orientation changes.
I'm trying to create a custom NSView to display in a column in a view-based NSTableView. The view contains 2 subviews, an NSTextField and an NSButton. I want the button to stay the width set by the constraints, and the textfield to resize when the NSView is resized. Below is a small animation showing the NSView and its subviews, and the constraints I created.
As you can see, resizing the NSView works as expected.
Now, when displaying this custom NSView in an NSTableView, it looks as if the button just disappears, and resizing the column makes the textfield resize with it (the 'Category' column).
The coded used to create the NSView in tableView:viewForTableColumn:row:
let identifier = tableColumn!.identifier
if identifier == "Category" {
var view = tableView.makeViewWithIdentifier(identifier, owner: self) as? TableCategoryView
if view == nil {
view = TableCategoryView(frame: tableView.frame)
view!.identifier = identifier
}
return view
}
The strange thing is, when there are no constraints on the 2 views, the button and textfield are both happily displayed inside the column, but they then of course don't resize with the table column width.
What am I doing wrong?
EDIT: It looks like something else is wrong. The NSView itself isn't resizing at all with the table column.
I think TableCategoryView is your new class and it is subclassed from NSView and shall replace the NSTableCellView you get when creating (in IB) a view based NSTableView. If you really want to create your own TableCellView it should be a direct subclass of NSTableCellView not NSView.
But in your case (add a button to the TableCellView) you do not need to create a new class. The existing TableCellView object already has a TextField (a property) with the name textField. Then simply drag (means: add) a button into the existing TableCellView (resize it and set the constraints) and drag a link from the button to a corresponding method in the delegate of the TableView. In the "corresponding method" you can ask for the clicked row and column and identify the click button. I did so for a TableView and for me it works well.
No matter what, it seems that my NSScrollViews always appear on top of any other view, even if the other view has been added more recently and should appear on top.
What can I do to get another view (say just a plain NSView) to appear above an NSScrollView?
I finally solved this by setting setWantsLayer to YES (true in this case since I'm using RubyMotion) on the NSScrollView, the NSScrollView's content view and the external view that I want to appear above the NSScrollView.
That solved my problem and allowed other views to appear above the NSScrollView.
So check your xib, and make sure your scrollview is at the topmost of your view hierarchy ("Document Outline"). However, when loaded this doesn't necessarily 100% guarantee that the scrollview will be drawn first. A way to manually force the order you'd like for your views is to programmatically move them around based off tags.
In Interface Builder, in the Attributes Inspector, go to the bottom and find the "View" section. Add a tag to the view, with 0 being the bottom most view you'd like, and going up from there.
Then in your controller, add this method definition & a call to it:
NSComparisonResult compareViews(id firstView, id secondView, void *context) {
NSInteger firstTag = [firstView tag];
NSInteger secondTag = [secondView tag];
if (firstTag == secondTag) {
return NSOrderedSame;
} else {
if (firstTag < secondTag) {
return NSOrderedAscending;
} else {
return NSOrderedDescending;
}
}
}
[self.view sortSubviewsUsingFunction:(NSComparisonResult (*)(id, id, void*))compareViews context:nil];
This will ensure that you have your views in the correct order you'd like
How can I get NSTableView to always show the same columns regardless of the horizontal scroller position? In the rightmost visible column I have custom cell views. I want the horizontal scroller to control what is being drawn in these custom views. The vertical scrolling should work normally.
I have tried several approaches without much success. For example, I can control the knob proportion of the horizontal scroller by making the table view wider, or by making the scroll view think its document view is actually wider than it is. One way is subclassing NSClipView and overriding -documentRect as follows:
-(NSRect)documentRect {
NSRect rect = [super documentRect];
rect.size.width += [[NSApp delegate] hiddenRangeWidth];
return rect;
}
However, while the scroller knob looks as it should and I can drag it right without moving the table view, when I start scrolling in another direction, the knob returns to the left edge. I also have the problem that I can't get the horizontal scroller to appear automatically. This happens with the original classes as well, not just with my custom clip view. Could these problems be related?
I have also tried replacing the document view with a custom view that acts as a proxy between the clip view and the table view. Its -drawRect: calls the table view's -drawRect:. However, nothing is drawn. I guess this is because the table view now has no superview. If the table view were added to this proxy view as a subview, it would move with it. How would I make it stationary in horizontal axis?
So, to reiterate:
What is the best way to make a table view scrollable, while always showing the same columns regardless of the horizontal scroller position?
What is the best way to get the scroller position and knob proportion? Should I add an observer for the NSViewBoundsDidChangeNotification from NSClipView?
I finally managed to solve the problem by letting the scroll view and table view behave normally, and adding an NSScroller. In order to make hiding the scroller easier, I decided to use Auto Layout and add it in Interface Builder. (The Object library doesn't include a scroller, but you can add a custom view and set its class to NSScroller.) I set the height of the scroller as a constraint, and bound the scroller and the constraint to outlets in code:
#property (nonatomic, retain) IBOutlet NSScroller *scroller;
#property (nonatomic, unsafe_unretained) IBOutlet NSLayoutConstraint *scrollerHeightConstraint;
Now I can make the scroller visible or hide it when necessary:
if (_zoomedIn) {
_scrollerHeightConstraint.constant = [NSScroller scrollerWidthForControlSize:NSRegularControlSize scrollerStyle:NSScrollerStyleOverlay];
[_scroller setKnobProportion:(_visibleRange / _maxVisibleRange)];
[_scroller setDoubleValue:_visibleRangePosition];
[_scroller setEnabled:YES];
} else {
_scrollerHeightConstraint.constant = 0.0;
}
Here the properties visibleRange, maxVisibleRange and visibleRangePosition are the length of the visible range (represented by the scroller knob), the total range (represented by the scroller slot), and the start of the visible range (the knob position), respectively. These can be read by binding the scroller's sent action to the following method in Interface Builder:
- (IBAction)scrollAction:(id)sender {
switch (self.scroller.hitPart) {
case NSScrollerNoPart:
break;
case NSScrollerDecrementPage:
_visibleRangePosition = MAX(_visibleRangePosition - _visibleRange / _maxVisibleRange, 0.0);
self.scroller.doubleValue = _visibleRangePosition;
break;
case NSScrollerIncrementPage:
_visibleRangePosition = MIN(_visibleRangePosition + _visibleRange / _maxVisibleRange, 1.0);
self.scroller.doubleValue = _visibleRangePosition;
break;
case NSScrollerKnob:
case NSScrollerKnobSlot:
_visibleRangePosition = self.scroller.doubleValue;
break;
default:
NSLog(#"unsupported scroller part code %lu", (unsigned long)self.scroller.hitPart);
}
// Make the custom cell views draw themselves here.
}
In order to get the scrolling work with gestures, we need to implement -scrollWheel: in the custom cell view class:
- (void)scrollWheel:(NSEvent *)event {
if (event.deltaX != 0.0) {
NSScroller *scroller = appDelegate.scroller;
if (scroller.isEnabled) {
double delta = event.deltaX / (NSWidth(scroller.bounds) * (1.0 - scroller.knobProportion));
scroller.doubleValue = MIN(MAX(scroller.doubleValue - delta, 0.0), 1.0);
}
}
if (event.deltaY != 0.0) {
[self.nextResponder scrollWheel:event];
}
}
I thought I could've just passed the event to the scroller, but apparently it doesn't handle the event. The above code doesn't seem to handle bounce back, and momentum scrolling doesn't always work. Sometimes the knob just halts in the middle of the motion. I believe this has to do with the scroller style being NSScrollerStyleLegacy by default. Setting it to NSScrollerStyleOverlay would require changes to the layout, so I haven't tried it yet.
Another problem is that the scrollers don't blend into each other in the corner like they do in a scroll view (see below). Maybe NSScrollerStyleOverlay would fix this, too.
The question: Why having a header view prevents scroll view from being resized by auto layout?
I'm trying to embed my custom view in a scroll view, which in turn is enclosed in a split view. I've created the following view hierarchy using Interface Builder in Xcode 4.5 DP 4, but the same problem seems to happen also in Xcode 4.4.
NSWindow
NSView (content view of the window)
NSSplitView
NSView (split view panel)
NSView (split view panel)
NSScrollView
TestView (my custom view)
Now, if TestView provides a NSTableHeaderView (via -headerView) property the split view divider cannot be dragged all the way to bottom (or right) to hide the TestView but stops to the boundary of the initial width or height of the TestView. If the -headerView property returns nil, the divider can be dragged freely.
This can be reproduced every time, just by creating a fresh Cocoa application project, adding the views and running the project. The steps:
Create a new Cocoa Application project
Create TestView class with headerView property which returns a NSTableHeaderView instance.
Edit MainMenu.xib and add a split view
Add custom view and make it TestView
Choose Editor -> Embed in -> Scroll view
Run the project
(No constraints or other Interface Builder menus touched)
TestView.m:
#implementation TestView {
NSTableHeaderView *_header;
}
- (NSTableHeaderView *)headerView
{
if (!_header) {
_header = [[NSTableHeaderView alloc]
initWithFrame:NSMakeRect(0.0, 0.0, 100.0, 17.0)];
}
return _header;
}
#end
Any pointers, what should I do to get the split view divider moving again?
Implement this NSSplitViewProtocol method in a convenient class:
- (BOOL)splitView:(NSSplitView *)splitView shouldAdjustSizeOfSubview:(NSView *)subview {return TRUE;}
Make sure to connect the split view's delegate output the class object.
The split view can now be adjusted to any size.
My solution was to manually remove the autoresizing constraints of the table header:
NSTableHeaderView *headerView = outlineView.headerView;
NSView *headerViewSuperview = headerView.superview;
[headerViewSuperview removeFromSuperview];
headerView.superview.translatesAutoresizingMaskIntoConstraints = NO;
[scrollView addSubview:headerViewSuperview];