一款超级简单的下拉列表demo用法: PTLMenuButton *btn = initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 40) menuTitles];
NSArray * listArr1 = @;
NSArray * listArr2 = @;
btn.listTitles = @;
btn.delegate = self;
;遵循PTLMenuButtonDelegate代理协议:// PTLMenuButtonDele ...
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