iOS中自定義導航欄左邊返回按鈕和按鈕不能靠左的問題

//自定義左邊 的按鈕  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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