[英]ios 5 change the background of back button in navigation controller to transparent
我已經使用背景圖像自定義了導航控制器標題欄,但我真的很難將后退按鈕的背景顏色更改為透明,以便與其下方的綠色標題欄匹配。 我是iOS開發的新手。 任何人都可以建議可以做些什么?
這是我用來更改導航控制器標題欄的代碼,以防它有幫助:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
if ([self.navigationController.navigationBar respondsToSelector:@selector(setBackgroundImage:forBarMetrics:)] ) {
UIImage *image = [UIImage imageNamed:@"greenbar.png"];
[self.navigationController.navigationBar setBackgroundImage:image forBarMetrics:UIBarMetricsDefault];
// [[UIBarButtonItem appearance] setBackButtonBackgroundImage:image forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
}
//change back button image
}
編輯 :做了一些研究后,我設法得到了我想要的東西。 以下是更改后退按鈕的背景圖像的代碼:
UIImage *image1 = [UIImage imageNamed:@"back-bt.png"];
[[UIBarButtonItem appearance] setBackButtonBackgroundImage:image1 forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
上面的代碼將圖像添加到導航控制器中的所有后退按鈕。
您無法更改默認后退按鈕的外觀,但您可以創建自己的按鈕來替換它。
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
if ([self.navigationController.navigationBar respondsToSelector:@selector(setBackgroundImage:forBarMetrics:)] ) {
UIImage *image = [UIImage imageNamed:@"greenbar.png"];
[self.navigationController.navigationBar setBackgroundImage:image forBarMetrics:UIBarMetricsDefault];
// [[UIBarButtonItem appearance] setBackButtonBackgroundImage:image forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
}
//change back button image
if(self.navigationController.viewControllers.count > 1) {
UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
[backButton setTitle:@"Back" forState:UIControlStateNormal];
[backButton addTarget:self action:@selector(didTapBackButton:) forControlEvents:UIControlEventTouchUpInside];
backButton.frame = CGRectMake(0.0f, 0.0f, 64.0f, 41.0f);
UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
self.navigationItem.leftBarButtonItem = backButtonItem;
}
}
- (void) didTapBackButton:(id)sender {
if(self.navigationController.viewControllers.count > 1) {
[self.navigationController popViewControllerAnimated:YES];
}
}
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