我用这个代码.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
view = [[UIView alloc] init];
[_window addSubview:view];
[view release];
NSLog(@"count - %d", [view retainCount]);
[self.window makeKeyAndVisible];
return YES;
}
- (IBAction)click{
NSLog(@"count - %d", [view retainCount]);
}
Run Code Online (Sandbox Code Playgroud)
当我点击uibutton时 - 我的视图保留计数= 2.为什么会发生这种情况?
我有一个UIPopoverController,必须向上显示箭头方向,但当我尝试在视图底部显示popover时,我看到:

[popoverController presentPopoverFromRect:[sender frame] inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];
Run Code Online (Sandbox Code Playgroud) 我需要像图像一样的块:

但在我添加此代码后:
<div style="width:100%; height:50px;">
<div style="display: inline-block; width:50%; height:50px; background-color:green;"> </div>
<div style="display: inline-block; width:50%; height:50px; background-color:red;"> </div>
</div>
Run Code Online (Sandbox Code Playgroud)
我有这个结果:

我在app delegate中设置了标签栏的颜色:
[[UITabBar appearance] setTintColor:[UIColor redColor]];
Run Code Online (Sandbox Code Playgroud)
它工作得很完美,但我还需要单独设置文本颜色.我希望我的图像是红色的,但文字必须是白色.
这有可能吗?