比如可能用到设置的:
设置按钮//使用系统的gearshape图片
[UIImage systemImageNamed:@"gearshape"];
UIBarButtonItem *leftItem = [[UIBarButtonItem alloc] initWithImage:[UIImage systemImageNamed:@"gearshape"] style:UIBarButtonItemStylePlain target:self action:@selector(returnLastController)];
//leftItem.tintColor = [UIColor whiteColor];///设置以后图片颜色跟随变化
self.navigationItem.leftBarButtonItem = leftItem;
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