【转载】iOS开发之屏幕旋转

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1. iOS有四个方向的旋转，为了保证自己的代码能够支持旋转，我们必须首先处理一个函数：

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
returnYES;
}

2. 这个函数时用来确定我们的应用所支持的旋转方向。如果想要支持每个方向则直接返回YES就行，还可以单独判断某一方向：

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    if(interfaceOrientation==UIInterfaceOrientationLandscapeLeft) {
        //left
    }
    if(interfaceOrientation==UIInterfaceOrientationLandscapeRight) {
        //right
    }
    if(interfaceOrientation==UIInterfaceOrientationPortrait) {
        //up
    }
    if(interfaceOrientation==UIInterfaceOrientationPortraitUpsideDown) {
        //down
    }
    returnYES;
}

3. 当然旋转还有一些函数可触发：

//旋转方向发生改变时
-(void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
}
//视图旋转动画前一半发生之前自动调用
-(void)willAnimateFirstHalfOfRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
}
//视图旋转动画后一半发生之前自动调用
-(void)willAnimateSecondHalfOfRotationFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation duration:(NSTimeInterval)duration {
}
//视图旋转之前自动调用
-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
}
//视图旋转完成之后自动调用
-(void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation {
}
//视图旋转动画前一半发生之后自动调用
-(void)didAnimateFirstHalfOfRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation {
}

本文固定链接: http://istar.name/blog/ios-development-rotation

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