屏幕旋转～随笔

1、方向旋转三种枚举

UIDeviceOrientation 设备当前的旋转方向
UIInterfaceOrientation 界面当前的旋转方向（控制器）
UIInterfaceOrientationMask 界面当前支持的旋转方向

2、方向控制优先级

Appdelegate代码控制 > Xcode的General设置（info.plist设置） > 控制器的代码控制

xcode设置

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App delegate

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界面控制

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3、界面控制注意事项

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4、单个界面强制旋转

//进入界面：设置横屏

[self setDeviceInterfaceOrientation:UIDeviceOrientationLandscapeLeft];

//方法1和方法2只有在shouldAutorotate返回YES的时候生效

//如果有导航控制器和Tabbar控制器，则要注意控制优先级

//方法1：强制屏幕旋转

(void)setInterfaceOrientation:(UIInterfaceOrientation)orientation {

if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {

SEL selector = NSSelectorFromString(@"setOrientation:");

NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];

[invocation setSelector:selector];

[invocation setTarget:[UIDevice currentDevice]];

int val = orientation;

[invocation setArgument:&val atIndex:2];

[invocation invoke];

}

}

//方法2：强制屏幕旋转

(void)setDeviceInterfaceOrientation:(UIDeviceOrientation)orientation {

if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {

[[UIDevice currentDevice] setValue:[NSNumber numberWithInteger:orientation] forKey:@"orientation"];

}

}