nicklockwood

Hacking UIView animation blocks for fun and profit

In this article, I'm going to explore a way that we can create views that implement custom Core Animation property animations in a natural way.

As we know, layers in iOS come in two flavours: Backing layers and hosted layers. The only difference between them is that the view acts as the layer delegate for its backing layer, but not for any hosted sublayers.

In order to implement the UIView transactional animation blocks, UIView disables all animations by default and then re-enables them individually as required. It does this using the actionForLayer:forKey: method.

Somewhat strangely, UIView doesn't enable animations for every property that CALayer does by default. A notable example is the layer.contents property, which is animatable by default for a hosted layer, but cannot be animated using a UIView animation block.

seivan

extension NSSet {
  @conversion func __conversion() -> Array<AnyObject> {
    return self.allObjects
  }
}

func returnImmutableNSSet()-> NSSet {
  return NSSet(array: [1,2,3,4])
}

mindbrix

NSString *hexString = @"1F0A7";

unsigned int character;
NSScanner* scanner = [NSScanner scannerWithString:hexString ];
[ scanner scanHexInt:&character ];

UTF32Char inputChar = NSSwapHostIntToLittle(character); // swap to little-endian if necessary
NSString *str = [[NSString alloc] initWithBytes:&inputChar length:4 encoding:NSUTF32LittleEndianStringEncoding];

JamesMGreene

Initialize

gitflow	git
git flow init	git init
	git commit --allow-empty -m "Initial commit"
	git checkout -b develop master

Connect to the remote repository

calebd

extension Array {
    
    func first() -> Element? {
        if isEmpty {
            return nil
        }
        return self[0]
    }
    
    func last() -> Element? {

steipete

- (void)testSparkInspectorCompatibility {
    PSPDFDocument *document = [[PSPDFTestAssetLoader new] documentWithName:@"Testcase_Metadata.pdf"];

    // Spark swizzles this method and calls description on the target. Let's simulate this for this test case, and then clean up.
    id<Aspect> token = [NSNotificationCenter aspect_hookSelector:@selector(addObserver:selector:name:object:) withOptions:0 usingBlock:^(id instance, NSArray *args) {
        [args.firstObject description];
    } error:NULL];

    // Load the document. This failed because of side effects in description when called during init.
    UIImage *image = [document imageForPage:0 size:CGSizeMake(100, 100) clippedToRect:CGRectZero annotations:nil options:nil receipt:NULL error:NULL];

steipete

- (void)testRelativeURLs {
    PSPDFDocument *document = [[PSPDFTestAssetLoader new] documentWithName:@"Testcase-relative-links.pdf"];
    NSArray *annotations = [document annotationsForPage:0 type:PSPDFAnnotationTypeLink];
    PSPDFLinkAnnotation *link = annotations[0];
    NSString *const referenceString = @"Testcase-relative-links/Simple.txt";
    XCTAssertEqualObjects(link.URL.absoluteString, referenceString, @"URL should be correct");

    PSPDFViewController *pdfController = [[PSPDFViewController alloc] initWithDocument:document];

    __block NSURL *showPreviewURL = nil;

aras-p

// Just before switching jobs:
// Add one of these.
// Preferably into the same commit where you do a large merge.
//
// This started as a tweet with a joke of "C++ pro-tip: #define private public",
// and then it quickly escalated into more and more evil suggestions.
// I've tried to capture interesting suggestions here.
//
// Contributors: @r2d2rigo, @joeldevahl, @msinilo, @_Humus_,
// @YuriyODonnell, @rygorous, @cmuratori, @mike_acton, @grumpygiant,

kylefox

# Tell system when Xcode utilities live:
sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer

# Set "opendiff" as the default mergetool globally:
git config --global merge.tool opendiff

m3nd3s

NERDTree

o.......Open files, directories and bookmarks....................|NERDTree-o|
go......Open selected file, but leave cursor in the NERDTree.....|NERDTree-go|
t.......Open selected node/bookmark in a new tab.................|NERDTree-t|
T.......Same as 't' but keep the focus on the current tab........|NERDTree-T|
i.......Open selected file in a split window.....................|NERDTree-i|
gi......Same as i, but leave the cursor on the NERDTree..........|NERDTree-gi|
s.......Open selected file in a new vsplit.......................|NERDTree-s|
gs......Same as s, but leave the cursor on the NERDTree..........|NERDTree-gs|

O.......Recursively open the selected directory..................|NERDTree-O|