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.

ndarville

Grab ffmpeg from https://www.ffmpeg.org/download.html

It's a command line tool which means you will have to type things with your keyboard instead of clicking on buttons.

The most trivial operation would be converting gifs:

ffmpeg -i your_gif.gif -c:v libvpx -crf 12 -b:v 500K output.webm

• -crf values can go from 4 to 63. Lower values mean better quality.
• -b:v is the maximum allowed bitrate. Higher means better quality.

JaviSoto

- (void)tapIntoViewControllerWillAppear {
  @weakify(self);
  [[[[[[[RACSignal interval:0.1f onScheduler:[RACScheduler mainThreadScheduler]] takeUntil:self.rac_willDeallocSignal] flattenMap:^RACStream *(id value) {
    @strongify(self);
    
    return [RACSignal return:self.pb_viewController];
  }] ignore:nil] take:1] flattenMap:^RACStream *(UIViewController *viewController) {
    return [viewController rac_signalForSelector:@selector(viewWillAppear:)];
  }] subscribeNext:^(id x) {
    @strongify(self);

steipete

#ifndef NS_DESIGNATED_INITIALIZER
#if __has_attribute(objc_designated_initializer)
#define NS_DESIGNATED_INITIALIZER __attribute((objc_designated_initializer))
#else
#define NS_DESIGNATED_INITIALIZER
#endif
#endif

krzysztofzablocki

# For training rest 5 min on compounds, 3-5 minutes on smaller ones

# Training A (first set to failure, second set -10% weight + 1 rep):
# Deadlift - 2x4-5
# Overhead Press - 1x6-8
# Weighted Chinup - 2x4-6
# Chest-Supported Rows - 2x6-8
# Close-grip chinup - 1x6-10

# Training B (first set to failure, second set -10% weight + 1 rep):

angelolloqui

@interface AGCommand : NSObject
 
@property(nonatomic, weak) UIResponder *firingObject;
@property(nonatomic, readonly) SEL action;
 
+ (instancetype)command;
 
@end

angelolloqui

@interface AGCommand : NSObject

@property(nonatomic, weak) UIResponder *firingObject;
@property(nonatomic, readonly) SEL action;

+ (instancetype)command;

@end

jdewind

- (void)viewDidLoad {
    UISearchBar *searchBar = [[UISearchBar alloc] initWithFrame: CGRectZero];
    self.searchController = [[UISearchDisplayController alloc] initWithSearchBar:self.searchBar contentsController:self];
    self.searchController.delegate = self;
    // Place it in view
    searchBar.delegate = self;
}

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)text {
    self.searchResults = [self search: text];

steipete

static void PSPDFFixCenteringInPrinterBrowserViewController(void) {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        // Patch the `UIPrinterSearchingView` class so we get a sane label placement in iOS 7.
        Class printerSearchingViewClass = NSClassFromString([NSString stringWithFormat:@"UI%@Searching%@", @"Printer", @"View"]);
        if (printerSearchingViewClass) {
            SEL customLayoutSubviewsSEL = NSSelectorFromString(@"pspdf_layoutSubviews");
            id customLayoutSubviews = ^(UIView *_self) {
                ((void( *)(id, SEL))objc_msgSend)(_self, customLayoutSubviewsSEL); // call original.
                @try {

steventroughtonsmith

typedef enum _UIBackgroundStyle {
	UIBackgroundStyleDefault,
	UIBackgroundStyleTransparent,
	UIBackgroundStyleLightBlur,
	UIBackgroundStyleDarkBlur,
	UIBackgroundStyleDarkTranslucent
} UIBackgroundStyle;

@interface UIApplication (UIBackgroundStyle)
-(void)_setBackgroundStyle:(UIBackgroundStyle)style;