如何设置iOS设备方向仅景观？

Question

I'm writing a simple app under MacOS using Xcode . I want my app to be in landscape mode always. So I set landscape orientation in project properties. But when I add a button to my window.subview , this button doesn't appear in landscape position.

I have only AppDelegate class. I've changed function: - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

I've added:

self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor purpleColor];
[self.window makeKeyAndVisible];

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setBackgroundColor:[UIColor whiteColor]];
[button setFrame:CGRectMake([[UIScreen mainScreen] bounds].size.width/2 - 50, [[UIScreen mainScreen] bounds].size.height/2,
                            100, 100)];
[button setTitle:@"Button" forState:UIControlStateNormal];
[self.window addSubview:button];

Update: I added [self.window setTransform:CGAffineTransformMakeRotation(-M_PI/2)];

and got:

Answer 1

Select your target project and make sure you have choose following landscape mode:

Answer 2

I've solved it like this:

1. create my own RootViewController (like in How to create root view controller )

2. then:

    self.rootController = [[AppRootViewController alloc] init]; self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; self.window.rootViewController = self.rootController; [self.window addSubview:self.rootController.view]; UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; .... [[[self.window rootViewController] view] addSubview:button]; 

Answer 3

There are two mechanisms that control this.

You already know about the target properties. If this is all you change, this should take care of it.

There is also a lower level control, which you might have picked up from old template code. For each view controller, if you implement the method

shouldRotateToInterfaceOrientation:

That will override the setting for the target. I suspect the superclasses implementation just refers to the target setting.

Answer 4

You can add UISupportedInterfaceOrientations property in YourProject-info.plist as follow, then it will only support landscape orientation.

<key>UISupportedInterfaceOrientations</key>
<array>
    <string>UIInterfaceOrientationLandscapeRight</string>
    <string>UIInterfaceOrientationLandscapeLeft</string>
</array>

but do not know what's the meaning with your two pictures