iOS中自定义导航栏左边返回按钮和按钮不能靠左的问题

//自定义左边 的按钮  ide UIButton *leftButton = [[UIButton alloc]init];spa     leftButton.frame = CGRectMake(0, 0, 20, 20);orm     [leftButton setBackgroundImage:[UIImage imageNamed:@"返回.png"] forState:UICont

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