How to stop and reverse a UIView animation?
In addition to the below (in which we grab the current state from the presentation layer, stop the animation, reset the current state from the saved presentation layer, and initiate the new animation), there is a much easier solution. If doing block-based animations, if you want to stop an animation and launch a new animation in iOS versions prior to 8.0, you can simply use the UIViewAnimationOpti
How do I adjust the anchor point of a CALayer, when Auto Layout is being used?
[EDIT: Warning: The entire ensuing discussion will be possibly outmoded or at least heavily mitigated by iOS 8, which may no longer make the mistake of triggering layout at the time that a view transform is applied.] Autolayout vs. View Transforms Autolayout does not play at all well with view transforms. The reason, as far as I can discern, is that you're not supposed to mess with the frame of a
Rotate CGPath without changing its position
A path doesn't have “a position”. A path is a set of points (defined by line and curve segments). Every point has its own position. Perhaps you want to rotate the path around a particular point, instead of around the origin. The trick is to create a composite transform that combines three individual transforms: Translate the origin to the rotation point. Rotate. Invert the translation from step 1.
iOS 7 UIPickerView non-selected row curvature modification multiple components
I am trying to modify the UIPickerView curvature to look like the iOS 7 Timer. Here is what I have: Note how the 2 and 4 are offset significantly from the 3 in the selected row. Is there a way to make it more 'flat', a la Timer in iOS7, where the 2 and 4 are directly above and below the 3? Here is what I have tried so far: Play around with - (CGFloat)pickerView:(UIPickerView *)pickerView widthForC
Returning an autorelease'd CFTypeRef with ARC
I am new to Automatic Reference Counting with LLVM and Objective-C, and have a question about returning CGImageRefs from my Objective-C function. In the days of manual reference counting, it was possible to simply cast the CGImageRef to an id, autorelease it, then return the original CGImageRef. With ARC, I am aware that you can direct the ARC system to autorelease and return your retainable objec
How to Autorelease a CGImageRef?
I have a method that returns a CGImageRef object. It contains this call: CGImageRef posterFrame = [avAssetImage copyCGImageAtTime:time actualTime:nil error:&error]; ... return posterFrame; This situation, as I understand it, calls for an autorelease. But I have no idea how to do it. I've tried using CFCollectable(), but it doesn't work. Any ideas?
CGContextSaveGState vs UIGraphicsPushContext
There are two drawRect methods: - (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSaveGState(context); // do drawing here CGContextRestoreGState(context); } And - (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext(); UIGraphicsPushContext(context); // do drawing here UIGraphicsPopContext(); } UIGraphicsPushContext / UIGraph
Custom property animation with actionForKey: how do I get the new value for the property?
In a CALayer subclass I'm working on I have a custom property that I want to animate automatically, that is, assuming the property is called "myProperty", I want the following code: [myLayer setMyProperty:newValue]; To cause a smooth animation from the current value to "newValue". Using the approach of overriding actionForKey: and needsDisplayForKey: (see following code) I was able to get it to ru
Deinit method is never called - Swift playground
In the next code I'm trying to call the deinit method releasing all the references to the Person Class instance Mark but the deinit is never called. Why? class Person{ let name:String init(name:String){ self.name = name println("Person created") } deinit { println("Person \(name) deinit") } } var Mark:Person? = Person(name:"Mark") Mark = nil // Shouldn't the person deinit method be called here? It
Overriding a readonly property in subclass
There is a class that looks like this (I'm omitting the imports for brevity): Base.h: @interface Base : NSObject @property (strong, readonly) NSString *something; - (id)initWithSomething:(NSString *)something; @end Base.m: @implementation Base - (id)initWithSomething:(NSString *)something { self = [super init]; if (self) _something = something; return self; } @end As you see, the 'something' prope
tableView:willDisplayHeaderView:inSection: not called when running for iOS 6.1
I did not find an equivalent question on stackoverflow, so I'll post my own question on that problem (please tell me if something is not understandable): Problem: I use a common indexed tableView with section headers from A-Z (like in the contacts.app) in a custom UITableViewController. I override tableView:viewForHeaderInSection: to provide my own section-header views. When the user scrolls the t
Centering a view in its superview using Visual Format Language
Currently, no, it doesn't look like it is possible to center a view in the superview using only VFL. It is, however, not that difficult to do it using a single VFL string and a single extra constraint (per axis): VFL: "|-(>=20)-[view]-(>=20)-|" [NSLayoutConstraint constraintWithItem:view attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:view.superview attribute:NSLayoutAttr
iOS7 last cell in UITableView section forces full width separator
The UITableView below has custom UITableViewCells and I can adjust the separators fine using this line in the custom UITableViewCell: self.separatorInset = UIEdgeInsetsMake(0, kDefaultSeparatorLeftInset, 0, 0); However the cell at the bottom of the section has a default separator that overrides the custom UIEdgeInsets that I set. I'd like all the separators to be the same width, is there any way o
Why is NSURLSession don't use my configured NSURLCache?
Seems like there are two potential issues: Your cache is too small. Historically, it wouldn't cache if the item being cached exceeded 10% of the total cache size. You're checking the disk usage 0.5 seconds after the last request. That might be too soon for the cache to be written to persistent storage. Below I use a bigger cache and wait 10 seconds before final check of disk usage, and the cache w
Can I change the size of UIActivityIndicator?
Whatever size i give to it while allocation, it shows fixed size only. Is it possible to increase it? Code: activityIndicator = [[UIActivityIndicatorView alloc] initWithFrame: CGRectMake(142.00, 212.00, 80.0, 80.0)]; [[self view] addSubview:activityIndicator]; [activityIndicator sizeToFit]; activityIndicator.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRight
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