beginSheet：block alternative？

Question

Snow Leopard是否引入了一些替代舊的beginSheet：方法，允許使用塊來完成整理工作？我不喜歡在另一個回調方法中使用它。

Answer 1

沒關係。我發現我正在尋找在這兩個網站：

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

其實，這是代碼，它是既GC和非GC完全兼容：

@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