你使用什么类型的方法来使Cocoa编程更容易？ [英] What kind of category methods do you use to make Cocoa programming easier?

问题描述

我使用Cocoa类的类别方法集合来使我的生活更轻松。我会发布一些例子，但我真的想看看其他编程人员提出了什么。

I use a collection of category methods for Cocoa's built in classes to make my life easier. I'll post some examples, but I really want to see what other coders have come up with. What kind of handy category methods are you using?

示例1：

@implementation NSColor (MyCategories)
+ (NSColor *)colorWithCode:(long)code
{
    return [NSColor colorWithCalibratedRed:((code & 0xFF000000) >> 24) / 255.0
                                     green:((code & 0x00FF0000) >> 16) / 255.0
                                      blue:((code & 0x0000FF00) >>  8) / 255.0
                                     alpha:((code & 0x000000FF)      ) / 255.0];
}
@end

// usage:
NSColor * someColor = [NSColor colorWithCode:0xABCDEFFF];

示例2：

@implementation NSView (MyCategories)
- (id)addNewSubViewOfType:(Class)viewType inFrame:(NSRect)frame
{
    id newView = [[viewType alloc] initWithFrame:frame];
    [self addSubview:newView];
    return [newView autorelease];
}
@end

// usage:
NSButton * myButton = [someView addNewSubviewOfType:[NSButton class]
                                            inFrame:someRect];

推荐答案

我真的很喜欢Andy Matuschak的 KVO + Blocks 类别 NSObject 。 （是的，它在内部添加一些新的类作为实现细节，但最终结果只是一个类别 NSObject ）。当你在 observeValueForKeyPath：ofObject：change：context：中观察KVO时，你可以提供一个块来执行一个符合KVO的值，而不必处理 c $ c>方法。

I've really been loving Andy Matuschak's "KVO+Blocks" category on NSObject. (Yes, it adds some new classes internally as implementation details, but the end result is just a category on NSObject). It lets you provide a block to be executed when a KVO-conforming value changes rather than having to handle every KVO observation in the observeValueForKeyPath:ofObject:change:context: method.

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