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NSArray *things = ^{
    NSMutableArray *tmpArray = [NSMutableArray arrayWithCapacity:numThings];
    for (int i = 0; i < numThings; i++)
    {
        [tmpArray addObject: ... ];
    }
    return [tmpArray copy];
}();

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extension ErrorType {
	
	var myLocalizedDescription: String {
		if self.dynamicType == NSError.self {
			return ((self as Any) as! NSError).localizedDescription
		}
		else {
			return "\(self)"
		}
	}

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Objective-C Bracing Style

I'm Adam Preble and this is the bracing style I like. Please don't use it unless you (a) like it, or (b) are contributing to a project of mine.

Rules

• Braces go on the next line for:
  • Method definitions.
  • if blocks:
  • After case statements, but only if required by local variables within the case.

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/// Convert a Pivotal Tracker story id (#1234, 1234) or URL into a Markdown link using the story number as the link text.
function markdownTrackerLink(text) {
  var regex = /\s*(http.*pivotaltracker\.com\/story\/show\/(\d+)|#?(\d+))\s*/;
  var id;
  var groups;

  if (regex.test(text)) {
    groups = regex.exec(text);
    id = groups[3] || groups[2];
    return "[#"+id+"](https://www.pivotaltracker.com/story/show/"+id+")";

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import Foundation

/// Helper object for more Swift-like KVO. To create, call NSObject.addObserverForKeyPath(_:handler:).
class KeyValueObserver: NSObject {
	
	private weak var observing: NSObject?
	private var keyPath: String
	private var handler: () -> Void
	
	private init(observing: NSObject, keyPath: String, handler: () -> Void) {

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protocol Protocol {
    func methodInProtocol() -> String
}

extension Protocol {
    func methodInProtocol() -> String {
        return "Protocol"
    }
    func methodOnExtension() -> String {

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Was getting the following errors when calling AVAssetImageGenerator generateCGImagesAsynchronously. The stream in question was an HLS stream. When I switched to using the AVURLAsset of an MP4, the error disappeared.

With Apple-supplied HLS stream:

Error Domain=AVFoundationErrorDomain Code=-11819 "Cannot Complete Action" UserInfo={NSLocalizedRecoverySuggestion=Try again later., NSLocalizedDescription=Cannot Complete Action, NSUnderlyingError=0x1c0057850 {Error Domain=NSOSStatusErrorDomain Code=-12178 "(null)"}}

With another HLS stream generated by a video hosting provider:

Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo={NSLocalizedFailureReason=An unknown error occurred (-12436), NSLocalizedDescription=The operation could not be completed, NSUnderlyingError=0x1c4a57e20 {Error Domain=NSOSStatusErrorDomain Code=-12436 "(null)"}}

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import Foundation

func > (left: NSDate, right: NSDate) -> Bool {
    return left.compare(right) == .OrderedDescending
}

extension NSCalendar {
    func dateRange(startDate startDate: NSDate, endDate: NSDate, stepUnits: NSCalendarUnit, stepValue: Int) -> DateRange {
        let dateRange = DateRange(calendar: self, startDate: startDate, endDate: endDate, stepUnits: stepUnits, stepValue: stepValue, multiplier: 0)
        return dateRange

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protocol Mutatable {}

extension Mutatable {
    func mutated(f: (inout Self) -> Void) -> Self {
        var copy = self
        f(&copy)
        return copy
    }
}

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@class BNRBlockView;

typedef void(^BNRBlockViewDrawer)(BNRBlockView *view, NSRect dirtyRect);

@interface BNRBlockView : NSView {
	BNRBlockViewDrawer drawBlock;
	BOOL opaque;
}

+ (BNRBlockView *)viewWithFrame:(NSRect)frame