您好我有一个要求,我需要通过拖动图像视图的右上角来调整和旋转图像视图。
我可以通过拖动它的角成功地调整图像视图的大小,但是当我尝试用一根手指为图像视图实现调整大小和旋转功能时失败了。
任何人都可以指导我实现我的要求。
我添加了下面的代码,用于从角边缘调整图像视图的大小。
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [[event allTouches] anyObject];
touchStart = [[touches anyObject] locationInView:self];
isResizingLR = (self.bounds.size.width - touchStart.x < kResizeThumbSize && self.bounds.size.height - touchStart.y < kResizeThumbSize);
isResizingUL = (touchStart.x <kResizeThumbSize && touchStart.y <kResizeThumbSize);
isResizingUR = (self.bounds.size.width-touchStart.x < kResizeThumbSize && touchStart.y<kResizeThumbSize);
isResizingLL = (touchStart.x <kResizeThumbSize && self.bounds.size.height -touchStart.y <kResizeThumbSize);
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
CGPoint touchPoint = [[touches anyObject] locationInView:self];
CGPoint previous=[[touches anyObject]previousLocationInView:self];
float deltaWidth = touchPoint.x-previous.x;
float deltaHeight = touchPoint.y-previous.y;
if (isResizingLR) {
self.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y,touchPoint.x + deltaWidth, touchPoint.y + deltaWidth);
}
if (isResizingUL) {
self.frame = CGRectMake(self.frame.origin.x + deltaWidth, self.frame.origin.y + deltaHeight, self.frame.size.width - deltaWidth, self.frame.size.height - deltaHeight);
}
if (isResizingUR) {
self.frame = CGRectMake(self.frame.origin.x ,self.frame.origin.y + deltaHeight, self.frame.size.width + deltaWidth, self.frame.size.height - deltaHeight);
}
if (isResizingLL) {
self.frame = CGRectMake(self.frame.origin.x + deltaWidth ,self.frame.origin.y , self.frame.size.width - deltaWidth, self.frame.size.height + deltaHeight);
}
if (!isResizingUL && !isResizingLR && !isResizingUR && !isResizingLL) {
self.center = CGPointMake(self.center.x + touchPoint.x - touchStart.x,self.center.y + touchPoint.y - touchStart.y);
}
}