beginSheet：替代块？ [英] beginSheet: block alternative?

问题描述

Snow Leopard不会引入一些替代旧的beginSheet：方法的方法，该方法允许使用块来完成整理工作吗？我不喜欢在其他回调方法中使用它。

Didn't Snow Leopard introduce some alternative to the old beginSheet: method that allows using a block to do the finishing stuff? I don't like having it in another callback method.

推荐答案

没关系。我在这两个站点上找到了所需的内容：

Never mind. I found what I'm looking for at these two sites:

http://www.mikeash.com/pyblog/friday-qa-2009-08-14-practical-blocks.html ，
http：//www.cocoabuilder。 com / archive / cocoa / 281058-sheets-blocks-and-garbage-collector.html

实际上，这是代码，并且完全兼容同时具有GC和非GC的系统：

In fact, this is the code, and it's fully compatible with both GC and non-GC:

@implementation NSApplication (SheetAdditions)

- (void)beginSheet:(NSWindow *)sheet modalForWindow:(NSWindow *)docWindow didEndBlock:(void (^)(NSInteger returnCode))block
{  
  [self beginSheet:sheet
    modalForWindow:docWindow
     modalDelegate:self
    didEndSelector:@selector(my_blockSheetDidEnd:returnCode:contextInfo:)
       contextInfo:Block_copy(block)];
}

- (void)my_blockSheetDidEnd:(NSWindow *)sheet returnCode:(NSInteger)returnCode contextInfo:(void *)contextInfo
{
  void (^block)(NSInteger returnCode) = contextInfo;
  block(returnCode);
  Block_release(block);
}

@end

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