设置系统返回按钮背景图片

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一、通过UIBarButtonItem 外观实例设置

1.图片拉伸

UIImage *backButtonImage = [[UIImage imageNamed:@"back_btn"] resizableImageWithCapInsets:UIEdgeInsetsMake(0,30, 0,0)];

2.设置

[[UIBarButtonItem appearance] setBackButtonBackgroundImage:backButtonImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];

在-(void)viewWillAppear:(BOOL)animated方法中执行希望再次更改返回按钮图片结果时灵时不灵

1.直接运行，可能不成功。

2.在[[UIBarButtonItem appearance] setBackButtonBackgroundImage:backButtonImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];加断点运行后再继续运行

又成功了

二、通过UINavigationBar 外观实例设置

[[UINavigationBar appearance] setBackIndicatorImage:[UIImage imageNamed:@"back_btn"]];

[[UINavigationBar appearance] setBackIndicatorTransitionMaskImage:[UIImage imageNamed:@"back_btn"]];

三、重新设置导航左按钮

UIButton* leftBtn = [UIButton buttonWithType:UIButtonTypeCustom];

leftBtn.frame = CGRectMake(0,0, 40,30);

[leftBtn setImage:[[UIImage imageNamed:@"back_btn"] tintColor:[UIColor whiteColor] level:1] forState:UIControlStateNormal];

leftBtn.imageView.contentMode = UIViewContentModeScaleAspectFit;

leftBtn.imageEdgeInsets = UIEdgeInsetsMake(0, -15,0, 15);

[leftBtn addTarget:self action:@selector(backClicked) forControlEvents:UIControlEventTouchUpInside];

self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithCustomView:leftBtn];

/**

* 返回按钮

-(void)backClicked{

[self.navigationController popViewControllerAnimated:YES];

}

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