ios - 多次缩放后图像缩小

Question

我不知道我做错了什么。多次缩放后我的图像变小了？!？我按如下方式初始化变量: 总规模 = 1.0； 最小比例 = 1.0； MAX_SCALE = 3.0;

这是我的捏合识别器方法:

- (void)pinchDetected:(UIPinchGestureRecognizer *)pinchRecognizer
{

CGFloat scale = pinchRecognizer.scale;
if (TOTAL_SCALE + (scale - 1.0) > MAX_SCALE) {
    scale = (MAX_SCALE - TOTAL_SCALE) + 1.0;
    TOTAL_SCALE = MAX_SCALE;
    imageView.transform = CGAffineTransformScale(imageView.transform, scale, scale);
}
else if(TOTAL_SCALE + (scale - 1.0) < MIN_SCALE){
    scale = (TOTAL_SCALE - MIN_SCALE) + 1.0;
    TOTAL_SCALE = MIN_SCALE;
    imageView.transform = CGAffineTransformScale(imageView.transform, scale, scale);
}
else{
    imageView.transform = CGAffineTransformScale(imageView.transform, scale, scale);
    TOTAL_SCALE += (scale - 1.0); 
}
pinchRecognizer.scale = 1.0;

}

有人能找出我的错误吗？提前致谢!

Answer 1

想想当 TOTALSCALE 大于 MAXSCALE 时这条线会产生什么:

scale = (MAX_SCALE - TOTAL_SCALE) + 1.0;

作为一般指南，您应该乘以比例，而不是相加。