Question

下面的代码完全可以正常运行iOS 5，但不适用于iOS 6或更高版本。我想要的是对于电子邮件作曲家表，navigationBar图像将与其他UINavigationBar类不同。我无法理解调试指针正在响应外观方法，但在设备上它将navigationBar图像显示为“bgNavigationBar.png”;预计是“bgNavigationBar_2.png”。

请指导我.......

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

这件事在ios6中不起作用。

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

您需要在Mail Handler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];
}

希望这对你有用。

UIAppearence支持IOS 6 - 意外结果

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