@property (strong) NSButton *shuffleButton;
self.shuffleButton = [[NSButton alloc] initWithFrame:CGRectMake(0, 0, 25, 14)];
self.shuffleButton.bordered = NO;
[self.shuffleButton setButtonType:NSMomentaryChangeButton];
[self.shuffleButton setBezelStyle:NSDisclosureBezelStyle];
[self.shuffleButton setImagePosition:NSImageOnly];
[self.shuffleButton setImage:[NSImage imageNamed:@"shuffle"]];
[self.shuffleButton setAlternateImage:[NSImage imageNamed:@"shuffle_highlight"]];
[self.shuffleButton setTarget:self];
[self.shuffleButton setAction:@selector(shuffleButtonAction:)];
shuffle 是normal状态下的image
shuffle_highlight 是按下状态的image
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