Mac SavePanel 保存文件的GUI代码

// Move the recorded temporary file to a user-specified location （视频文件另存储过程，依据用户选择的路径和文件保存名）
		NSSavePanel *savePanel = [NSSavePanel savePanel];
		[savePanel setAllowedFileTypes:[NSArray arrayWithObject:AVFileTypeQuickTimeMovie]];
		[savePanel setCanSelectHiddenExtension:YES];
		[savePanel beginSheetModalForWindow:[self windowForSheet] completionHandler:^(NSInteger result) {
			NSError *error = nil;
			if (result == NSOKButton) {
				[[NSFileManager defaultManager] removeItemAtURL:[savePanel URL] error:nil]; // attempt to remove file at the desired save location before moving the recorded file to that location
				if ([[NSFileManager defaultManager] moveItemAtURL:outputFileURL toURL:[savePanel URL] error:&error]) {
					[[NSWorkspace sharedWorkspace] openURL:[savePanel URL]];
				} else {
					[savePanel orderOut:self];
					[self presentError:error modalForWindow:[self windowForSheet] delegate:self didPresentSelector:@selector(didPresentErrorWithRecovery:contextInfo:) contextInfo:NULL];
				}
			} else {
				// remove the temporary recording file if it‘s not being saved
				[[NSFileManager defaultManager] removeItemAtURL:outputFileURL error:nil];
			}
		}];

效果图：

<img src="http://img.blog.csdn.net/20140807162831514?
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