CGImageCreate：无效的图像大小 0 x 0，打开控制中心时

Question

我正在开发一个带有自定义 UINavigationBar 的选项卡式应用程序。每当我在 iOS 模拟器中打开控制中心时，Xcode 中的命令行总是给我以下错误：

CGImageCreate：无效的图像大小 0 x 0。

它出现在每个 ViewController 中，即使是空的。

这可能与自定义 UINavigationBar 或 TabBar 相关吗？

这是我用于标签栏的 appdelegate.m 文件中的代码

    DMFirstViewController *firstViewController = [[DMFirstViewController alloc] init];
    DMSecViewController *secondViewController = [[DMSecViewController alloc] init];
    DMThirdViewController *thirdViewController = [[DMThirdViewController alloc] init];
    DMFourthViewController *fourthViewController = [[DMFourthViewController alloc] init];

    tabController = [[UITabBarController alloc] init];

    NSArray* controllers = [NSArray arrayWithObjects:firstViewController, secondViewController, thirdViewController, fourthViewController, nil];

    tabController.viewControllers = controllers;


    UIImage *unselectedTabFirst = [UIImage imageNamed:@"first_line.png"];
    UIImage *selectedTabFirst = [UIImage imageNamed:@"first_active.png"];

    UIImage *unselectedTabSec = [UIImage imageNamed:@"second_line.png"];
    UIImage *selectedTabSec = [UIImage imageNamed:@"second_active.png"];

    UIImage *unselectedTabThird = [UIImage imageNamed:@"third_line.png"];
    UIImage *selectedTabThird = [UIImage imageNamed:@"third_active.png"];

    UIImage *unselectedTabFourth = [UIImage imageNamed:@"fourth_line.png"];
    UIImage *selectedTabFourth = [UIImage imageNamed:@"fourth_active.png"];


    unselectedTabFirst = [unselectedTabFirst imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    selectedTabFirst = [selectedTabFirst imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

    unselectedTabSec = [unselectedTabSec imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    selectedTabSec = [selectedTabSec imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

    unselectedTabThird = [unselectedTabThird imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    selectedTabThird = [selectedTabThird imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

    unselectedTabFourth = [unselectedTabFourth imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    selectedTabFourth = [selectedTabFourth imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];



    firstViewController.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"first" image:unselectedTabFirst selectedImage:selectedTabFirst];

    secondViewController.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"second" image:unselectedTabSec selectedImage:selectedTabSec];

    thirdViewController.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"third" image:unselectedTabThird selectedImage:selectedTabThird];

    fourthViewController.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"fourth" image:unselectedTabFourth selectedImage:selectedTabFourth];

Answer 1

正如 Retro 中的链接所示，这只发生在 iOS 模拟器中。在开发者设备上运行应用程序不会产生此错误。

问题解决了！