如何删除已删除的UIImage [英] How to Unerase the erased UIImage
本文介绍了如何删除已删除的UIImage的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
嗨大家我正在尝试使用我的PanGesture中的图像擦除代码
我正在使用以下代码:
Hi Guys I am trying a Image erasing code in my PanGesture I am using code below:
UIImage * image = [UIImage imageNamed:@"326d4fb72362a2e44659141cadfc4977.jpg"];
holderView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 235)];
imgForeground = [[UIImageView alloc] initWithFrame:[holderView frame]];
[imgForeground setImage:image];
[holderView addSubview:imgForeground];
UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)];
[panRecognizer setMinimumNumberOfTouches:1];
[panRecognizer setMaximumNumberOfTouches:1];
[panRecognizer setDelegate:self];
[holderView addGestureRecognizer:panRecognizer];
[self.view addSubview:holderView];
然后我在这里处理这个
-(void)move:(id)sender {
CGPoint currentPoint;
if([(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateBegan){
lastPoint = [sender locationInView:imgForeground];
lastPoint.y -=20;
}
else{
currentPoint = [sender locationInView:imgForeground];;
currentPoint.y -=20;
}
UIGraphicsBeginImageContext(imgForeground.frame.size);
[imgForeground.image drawInRect:CGRectMake(imgForeground.frame.origin.x, imgForeground.frame.origin.y, imgForeground.frame.size.width, imgForeground.frame.size.height)];
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineCap(context,kCGLineCapRound); //kCGImageAlphaPremultipliedLast);
CGContextSetLineWidth(context, 10);
CGContextSetRGBStrokeColor(context, 0, 0, 0, 1.0);
CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeClear);
CGContextBeginPath(context);
CGContextMoveToPoint(context, lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(context, lastPoint.x, lastPoint.y);
CGContextStrokePath(context);
imgForeground.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
我的问题是如何删除相同的图像请帮助
推荐答案
在长时间搜索后,我在我的应用中遇到同样的问题,我发现了这个简单的解决方案问题。
I have the same issue in my app after the long search i found the simple solution for this issue.
我刚刚使用了触摸 UIViewController的方法
以下是我的方法,
代码: -
#pragma mark touches stuff...
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
lastTouch = [touch locationInView:self.editedImageView];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
currentTouch = [touch locationInView:self.editedImageView];
CGFloat brushSize;
if (isEraser)
{
brushSize=eraser;
}
else
{
brushSize=mark;
}
CGColorRef strokeColor = [UIColor whiteColor].CGColor;
UIGraphicsBeginImageContext(self.editedImageView.frame.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[self.editedImageView.image drawInRect:CGRectMake(0, 0, self.editedImageView.frame.size.width, self.editedImageView.frame.size.height)];
CGContextSetLineCap(context, kCGLineCapRound);
CGContextSetLineWidth(context, brushSize);
if (isEraser) {
CGContextSetStrokeColorWithColor(UIGraphicsGetCurrentContext(), [UIColor colorWithPatternImage:self.im].CGColor);
}
else
{
CGContextSetStrokeColorWithColor(context, strokeColor);
CGContextSetBlendMode(context, kCGBlendModeClear);
}
CGContextBeginPath(context);
CGContextMoveToPoint(context, lastTouch.x, lastTouch.y);
CGContextAddLineToPoint(context, currentTouch.x, currentTouch.y);
CGContextStrokePath(context);
self.editedImageView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
lastTouch = [touch locationInView:self.editedImageView];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
}
输入:
self.editedImageView.image = "Your Custom image";
self.im = "Your Custom image";
问题的简单解决方案是: -
CGContextSetStrokeColorWithColor(UIGraphicsGetCurrentContext(), [UIColor colorWithPatternImage:self.im].CGColor);
注意:
这不会再次删除图像
更新: -
self.im = "Your Custom image";
这将是这样....
-(void)eraserConfigure
{
UIImageView *resizeImage=[[[UIImageView alloc]initWithImage:editedImage]autorelease];
/*UIImage */self.im=[UIImage imageFromView:resizeImage scaledToSize:CGSizeMake(self.editedImageView.frame.size.width, self.editedImageView.frame.size.height)];
}
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