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;
    }
}