Iphone tabbar问题中的自定义按钮

我有一个TabBarController应用程序

此代码位于didFinishingLaunching方法中：

UIImage *buttonImage = [UIImage imageNamed:@"post-button2.png"];

UIButton* button = [UIButton buttonWithType:UIButtonTypeCustom];

NSLog(@"Button size: %f, %f", buttonImage.size.width, buttonImage.size.height);

button.frame = CGRectMake(0.0, 0.0, buttonImage.size.width, buttonImage.size.height);
[button setBackgroundImage:buttonImage forState:UIControlStateNormal];

CGFloat heightDifference = buttonImage.size.height - self.tabBarController.tabBar.frame.size.height;

NSLog(@"self.tabBarController.tabBar.frame.size.height: %f", self.tabBarController.tabBar.frame.size.height);
NSLog(@"heightDifference: %f", heightDifference);
NSLog(@"%Tabbar: %f, %f", tabBarController.tabBar.center.x, tabBarController.tabBar.center.y);
if (heightDifference < 0)
    button.center = tabBarController.tabBar.center;
else {
    CGPoint center = self.tabBarController.tabBar.center;
    center.y = center.y - heightDifference/2.0;
    button.center = tabBarController.tabBar.center;
}

NSLog(@"%Button: %f, %f", button.center.y, button.center.x);

[tabBarController.view addSubview:button];

[self.window addSubview:tabBarController.view];
[self.window makeKeyAndVisible];

但我不确定这是否正确

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Ty.

要设置选项卡的图像，需要设置与该选项卡关联的viewcontroller的tabBarItem

有关如何使用自定义图像创建一个，请参见UITABBARIEM ref

因此，可以使用自定义图像创建UITabBarItem对象，然后将其作为选项卡的viewcontroller的tabBarItem属性

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然后，UITabBarController将设法将图像放置在正确的位置

它不是选项卡栏项目，而是选项卡栏上的自定义按钮。

CGPoint center = tabBarController.tabBar.center;
center.x = 160.00;
center.y = 455.50;

button.center = center;