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By Alper Çuğun コンピューターやプログラミングの情報交換を行う「ナレッジコミュニティ」であるStack Overflowには常に世界中から多くの質問が寄せられ、さらにはそれに回答する書き込みが多く投稿されています。サイトでは8秒に1個の割合で質問が寄せられ、2015年には5万6033人もの開発者が質問に答えているのですが、Stack Overflowではそれら回答者に対して45個のアンケート調査を実施して、どのようなユーザーがサービスを利用しているのか調査を行いました。 Stack Overflow Developer Survey 2016 Results http://stackoverflow.com/research/developer-survey-2016 この統計を発表するにあたりStack Overflowは「調査は完璧というわけではありません。サンプル数が多
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?
Note: Things have moved on since this question was asked; see here for a good recent overview. Before auto layout, you could change the anchor point of a view's layer without moving the view by storing the frame, setting the anchor point, and restoring the frame. In an auto layout world, we don't set frames any more, but constraints don't seem up to the task of adjusting the position of a view bac
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
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
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
iOS: How do I support Retina Display with CGLayer?
I'm drawing a graph on a CALayer in its delegate method drawLayer:inContext:. Now I want to support Retina Display, as the graph looks blurry on the latest devices. For the parts that I draw directly on the graphics context passed by the CALayer, I could nicely draw in high resolution by setting the CALayer's contentScale property as follows. if ([myLayer respondsToSelector:@selector(setContentsSc
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