iOS学习之自定义视图时,在屏幕发生旋转时触发重新布局方法

 

如果要对自定义的视图在屏幕旋转时重新布局,则在自定义视图中定义以下触发方法:

-(void)layoutSubviews {

    [super layoutSubviews];

    //1.获取到屏幕旋转的方向

    UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;

    //2.根据屏幕旋转方向布局子视图

    switch (orientation) {

            //竖直方向

        case UIDeviceOrientationPortrait:

            //倒立

        case UIDeviceOrientationPortraitUpsideDown:

        {

            CGRect fram = self.loginButton.frame;

            fram.origin.x = kMarginTop_LoginButton;

            fram.origin.y = kMarginTop_LoginButton;

            self.loginButton.frame = fram;

        }

            break;

            

            //右横屏

        case UIDeviceOrientationLandscapeRight:

            //左横屏

        case UIDeviceOrientationLandscapeLeft:

        {

            CGRect fram = self.loginButton.frame;

            fram.origin.x = kMarginLeft_LoginButton_Landscape;

            fram.origin.y = kMarginTop_DescripLabel;

            self.loginButton.frame = fram;

        }

            break;

            

        default:

            break;

    }

}