iOS开发笔记之代码控制屏幕旋转

// 能否自动旋转

-(BOOL)shouldAutorotate{

    return NO;

}

// 支持的屏幕方向

-(UIInterfaceOrientationMask)supportedInterfaceOrientations{

    return UIInterfaceOrientationMaskPortrait;

}

// 默认的屏幕方向

-(UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{

    return UIInterfaceOrientationPortrait;

}

// 强制屏幕旋转

- (void)setLandscape:(UIDeviceOrientation)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]];

        [invocation setArgument:&orientation atIndex:2];

        [invocation invoke];

    }

}