缩放IOS中用于调整大小和裁剪图像的uiscrollview时出现问题
我正在开发一个应用程序,其中一个视图中有(图像保存),我有三种不同的尺寸,我希望在用户缩放从滚动视图中捕获的图像(当用户单击保存时)后,将图像保存在其中 以下是我的密码: 选择样式后,根据选择的类型设置宽度和高度,然后调用scrollview创建方法缩放IOS中用于调整大小和裁剪图像的uiscrollview时出现问题,ios,objective-c,uiscrollview,uiimageview,pinchzoom,Ios,Objective C,Uiscrollview,Uiimageview,Pinchzoom,我正在开发一个应用程序,其中一个视图中有(图像保存),我有三种不同的尺寸,我希望在用户缩放从滚动视图中捕获的图像(当用户单击保存时)后,将图像保存在其中 以下是我的密码: 选择样式后,根据选择的类型设置宽度和高度,然后调用scrollview创建方法 -(void)viewDidAppear:(BOOL)animated{ if(!([getColor length] == 0)) { [theColored setHidden:NO]; [imageView setImage:
-(void)viewDidAppear:(BOOL)animated{
if(!([getColor length] == 0))
{
[theColored setHidden:NO];
[imageView setImage:image];
[theStyle setHidden:NO];
[theStyled setHidden:YES];
}
if(!([getStyle length] == 0))
{
[theColored setHidden:NO];
[imageView setImage:image];
[theStyle setHidden:YES];
[theStyled setHidden:NO];
[Save setHidden:NO];
if([theType isEqual: @"Pant"]){
theW = 200;
theH = 260;
}else if ([theType isEqual:@"Shirt"])
{
theW = 220;
theH = 220;
}else if([theType isEqual:@"Shoes"])
{
theW = 200;
theH = 60;
}
// UIImage *savedImage = image;
CGFloat theScale = 1.0;
[self setTheView:image andFrameW:&theW andFrameH:&theH andTheScale:&theScale];
}}
方法如下:
-(void)setTheView:(UIImage *)savedImage andFrameW:(CGFloat *)theFW andFrameH:(CGFloat *)theFH andTheScale:(CGFloat *)theScale{
NSLog(@"called");
CGFloat theS = *theScale;
CGFloat imgW ;
CGFloat imgH;
imgW = *theFW * theS;
imgH = *theFH * theS;
// = savedImage.size.height * theS;
[dot removeFromSuperview];
[scrollView setPagingEnabled:NO];
[scrollView setShowsHorizontalScrollIndicator:NO];
[scrollView setShowsVerticalScrollIndicator:NO];
scrollView.layer.masksToBounds=YES;
scrollView.minimumZoomScale = 0.1f;
scrollView.maximumZoomScale = 5.0f;
[scrollView setZoomScale:0.5];
scrollView.layer.borderColor = [UIColor blackColor].CGColor;
scrollView.contentInset = UIEdgeInsetsMake(0, 0, 0, 0);
[scrollView setContentSize:CGSizeMake(imgW*2,imgH*2)];
dot =[[UIImageView alloc] initWithFrame:CGRectMake(imgW/2,imgH/2,imgW,imgH)];
dot.image=savedImage;
dot.contentMode = UIViewContentModeScaleAspectFit;
[scrollView setScrollEnabled:YES];
[scrollView setTranslatesAutoresizingMaskIntoConstraints:YES];
scrollView.frame = CGRectMake(scrollView.frame.origin.x,scrollView.frame.origin.y, *theFW , *theFH);
[scrollView setHidden:NO];
[scrollView setContentOffset:CGPointMake(imgW/2,imgH/2) animated:NO];
[scrollView addSubview:dot];
}
缩放方法:
- (UIView *) viewForZoomingInScrollView:(UIScrollView *)scrollView {
return dot;
}
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale{
NSLog(@"zoomed");
NSLog(@"%f",scale);
[self setTheView:image andFrameW:&theW andFrameH:&theH andTheScale:&scale];
}
问题:
我这里有两个问题:
1-缩放比例不是从最后到达的点开始
2-轻触缩放时,即使在开始缩放之前也会移动
更新编辑
两个问题都解决了
我没有在缩放后再次调用该方法,而是更改了内容大小
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale{
[self setTheView:image andFrameW:&theW andFrameH:&theH andTheScale:&scale];
}
替换为
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale{
scrollView.contentSize = CGSizeMake((dot.bounds.size.width*scale)*2,(dot.bounds.size.height*scale)*2);
}
但我有一个新的问题出现了,放大后contentOffSet上下不相等,还左下写
数字解释:
<----------------------------Content Size---------------------------->
| left offset |<---------Scrollviewframe--------->|Right offset|
但是什么也没做。问题解决了,如果有人想在
allowsdediting=YES时使用scrollview进行裁剪和缩放,我想与大家分享答案代码>不提供设置rect大小的功能
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale{
CGFloat zoomedW = dot.bounds.size.width*scale;
CGFloat zoomedH = dot.bounds.size.height*scale;
CGFloat frameW = scrollView.frame.size.width;
CGFloat frameH = scrollView.frame.size.height;
scrollView.contentSize = CGSizeMake(frameW+zoomedW ,frameH+zoomedH);
}
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale{
CGFloat zoomedW = dot.bounds.size.width*scale;
CGFloat zoomedH = dot.bounds.size.height*scale;
CGFloat frameW = scrollView.frame.size.width;
CGFloat frameH = scrollView.frame.size.height;
scrollView.contentSize = CGSizeMake(frameW+zoomedW ,frameH+zoomedH);
}