目标C语言 ui外观支持IOS 6 -意想不到的结果

Question

下面的代码在iOS 5上运行良好，但在iOS 6或更高版本上就不行了。我想要的是，对于Email composer表单，navigationBar图像将不同于其他的UINavigationBar类。我无法理解，调试指针是响应的外观方法，但在设备上它显示导航栏图像为"bgNavigationBar.png";"bgNavigationBar_2.png"

请指引我.......

if ([[UINavigationBar class]respondsToSelector:@selector(appearance)]) {
    UIImage *logoImage44 = [[UIImage imageNamed:@"bgNavigationBar.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 0, 0, 0)];
    [[UINavigationBar appearance] setBackgroundImage:logoImage44 forBarMetrics:UIBarMetricsDefault];
    UIImage *ImagePlain = [[UIImage imageNamed:@"bgNavigationBar_2.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 0, 0, 0)];
    [[UINavigationBar appearanceWhenContainedIn:[MFMailComposeViewController class], nil] setBackgroundImage:ImagePlain forBarMetrics:UIBarMetricsDefault];
}

Answer 1

这个东西不能在ios6中工作。

[[UINavigationBar appearanceWhenContainedIn:[MFMessageComposeViewController class], nil] setBackgroundImage:[UIImage imageNamed:@"bgNavigationBar_2.png"] forBarMetrics:UIBarMetricsDefault];

您只需要在邮件处理程序类中设置此属性。

if (![[UINavigationBar class]respondsToSelector:@selector(appearance)])
{
    UIView *backgroundView = [[[UIView alloc] initWithFrame:CGRectMake(0,0,320,44)]autorelease];
    [backgroundView setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"bgNavigationBar_2.png"]]];
    controller.topViewController.navigationItem.titleView = backgroundView ;
}
else
{
    UIImage *gradientImagePlain = [[UIImage imageNamed:@"bgNavigationBar_2.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 0, 0, 0)];
    [[UINavigationBar appearance] setBackgroundImage:gradientImagePlain forBarMetrics:UIBarMetricsDefault];
}

，然后为所有其他导航控制器的背景图像重置另一个图像。

- (void)messageComposeViewController:(MFMessageComposeViewController *)controller didFinishWithResult:(MessageComposeResult)result
{
    [self.parentController dismissModalViewControllerAnimated:YES];
    UIImage *gradientImagePlain = [[UIImage imageNamed:@"bgNavigationBar.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 0, 0, 0)];
    [[UINavigationBar appearance] setBackgroundImage:gradientImagePlain forBarMetrics:UIBarMetricsDefault];
}