Question

使用uipinchguesters我正在获得缩放和变换值，如下面的代码

-(void)Scale:(id)sender {

   if([(UIPinchGestureRecognizer*)sender state] == UIGestureRecognizerStateBegan) {
            _lastScale = 1.0;
        }

        CGFloat scale = 1.0 - (_lastScale - [(UIPinchGestureRecognizer*)sender scale]);
        CGAffineTransform currentTransform = imgView.transform;
        CGAffineTransform newTransform = CGAffineTransformScale(currentTransform, scale, scale);
        imgView.layer.allowsEdgeAntialiasing = YES;

        [imgView setTransform:newTransform];
       // CGAffineTransform newtransform = imgView.transform;

        _lastScale = [(UIPinchGestureRecognizer*)sender scale];
        [self showOverlayWithFrame:imgView.frame];

        CGAffineTransform transform = CGAffineTransformIdentity;
        transform=imgView.transform;

        NSLog(@"%@",NSStringFromCGAffineTransform(transform));

        [[NSUserDefaults standardUserDefaults]
         setValue:[NSString stringWithFormat:@"%f",scale] forKey:@"Scale"];
        [[NSUserDefaults standardUserDefaults]
         setValue:NSStringFromCGAffineTransform(transform) forKey:@"Transform"];
 }

然后我在nsuserdefaults中保存变换和缩放值....

并杀死应用程序并再次运行它我们可以映像相同的位置...... 我正在更新像这个比例和转换值

 CGRect frameValue = CGRectFromString(
                                    [[NSUserDefaults standardUserDefaults] stringForKey:@"frame"]);

    NSString *roatValue=[[NSUserDefaults standardUserDefaults] stringForKey:@"Rotation"];
    CGFloat rotation=[roatValue floatValue];

    CGAffineTransform currentTransform=CGAffineTransformFromString([[NSUserDefaults standardUserDefaults] stringForKey:@"Transform"]);

    NSString *scaleValue=[[NSUserDefaults standardUserDefaults] stringForKey:@"Scale"];
    CGFloat scale=[scaleValue floatValue];

    Last Session Rotation

    imgView.transform=CGAffineTransformScale(currentTransform,scale, scale);

    imgView.frame=frameValue;

Answer 1

通过在UIView上设置frame - 属性，您将删除图层上的所有转换。

如果视图已转换，请使用bounds和position。

尚未测试，但翻转设置顺序可能有效：

imgView.frame = frameValue;
imgView.transform = CGAffineTransformScale(currentTransform, scale, scale);

应用Uiimageview Not Working的图像比例和CGaffineTransformation值

1 个答案: