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手势的一些注意事项
对于 UITapGestureRecognizer 来说我们一般需要知道该点击手势在屏幕中的位置 （locationInView:self）
对于 UIPanGestureRecognizer 来说我们一般需要知道我们的滑动手势移动了多少距离 （translationInView:pan）
-(void) pan: (UIPanGestureRecognizer * ) pan { CGPoint transP = [pan translationInView: pan.view]; //$1 = (x = 0.73990527317289434, y = 0) CGPoint pont1 = [pan locationInView: self]; //$2 = (x = 198.16665649414063, y = 342.33332824707031) CGPoint pont2 = [pan locationInView: self.imageV]; //$3 = (x = 198.12057060663793, y = 342.61609831987914) pan.view.transform = CGAffineTransformTranslate(pan.view.transform, transP.x, transP.y); //复位 [pan setTranslation: CGPointZero inView: pan.view]; } [UIView animateWithDuration: 0.25 animations: ^ { self.imageView.alpha = 0; }completion: ^ (BOOL finished){ self.imageView.alpha = 1; UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, 0); CGContextRef ctx = UIGraphicsGetCurrentContext(); [self.layer renderInContext: ctx]; UIImage * imageGot = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); [self.imageView removeFromSuperview]; if (self.delegate && [self.delegate respondsToSelector: @selector(handleImageView: didOperatedImage: )]){ [self.delegate handleImageView: self didOperatedImage: imageGot]; } } ];接下来来一个iOS图形绘制、旋转、长按、缩放、滑动等综合手势的一个 画图 项目
