这个问题适用于运行iOS 7的
Xcode 5,并且非常奇怪.我试图将所有UInavigation和UIBarButtonItem文本颜色设置为白色.
所以在我的app启动委托中,我将代码设置为.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
UIImage *NavigationPortraitBackground = [UIImage imageNamed:@"button_header_blue"];
// Set the background image all UINavigationBars
[[UINavigationBar appearance] setBackgroundImage:NavigationPortraitBackground forBarMetrics:UIBarMetricsDefault];
// Set the text appearance for navbar
[[UINavigationBar appearance] setTitleTextAttributes:
[NSDictionary dictionaryWithObjectsAndKeys:
[UIColor whiteColor],UITextAttributeTextColor,[UIColor whiteColor],UITextAttributeTextShadowColor,[NSValue valueWithUIOffset:UIOffsetMake(0,0)],UITextAttributeTextShadowOffset,[UIFont fontWithName:@"Helvetica Neue" size:21],UITextAttributeFont,nil]];
[[UINavigationBar appearance] setTintColor:[UIColor whiteColor]];
NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:
[UIColor whiteColor],nil];
[[UIBarButtonItem appearance] setTitleTextAttributes:attributes forState: UIControlStateNormal];
[[UIBarButtonItem appearance] setTintColor:[UIColor whiteColor]];
// Override point for customization after application launch.
return YES;
}
如果我两次启动“发送邮件”操作
– 我第一次看到UIBarButton项目是白色的.我看着它并点击取消按钮
– 第二次我看到他们所有人都变灰了,除了头衔之外几乎看不见.
– 这在我的iPhone模拟器和运行iOS 7的iPhone上都有发生.
我怎样才能解决这个问题？
解决方法
我必须这样做才能在iOS 7上运行
if ([MFMailComposeViewController canSendMail])
{
MFMailComposeViewController *mailViewController = [[MFMailComposeViewController alloc] init];
mailViewController.mailComposeDelegate = self;
[mailViewController.navigationBar setTintColor:[UIColor whiteColor]];
[mailViewController.navigationBar setBarTintColor:[UIColor whiteColor]];
....