##手勢的一些注意事項
對於 UITapGestureRecognizer 來說我們一般需要知道該點選手勢在螢幕中的位置 (locationInView:self)
對於 UIPanGestureRecognizer 來說我們一般需要知道我們的滑動手勢移動了多少距離 (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);
//復位
[pan setTranslation: CGPointZero inView: pan.view];
}
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[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];
}
}
];
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接下來來一個iOS圖形繪製、旋轉、長按、縮放、滑動等綜合手勢的一個 畫圖 專案
##** 程式碼地址