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.size.height = ratioHW * imageRect.size.width;
imageRect.origin.x = 0;
}
else{
imageRect.size.width = _mainImage.size.width;
imageRect.size.height = _mainImage.size.height;
imageRect.origin.x = (scWidth - imageRect.size.width)/2;
}
///height
if (imageRect.size.height > scHeight) {
imageRect.origin.y = 0;
}
else{
imageRect.origin.y = (scHeight - imageRect.size.height)/2;
}
return imageRect;
}
return CGRectZero;
}
/**
获取点击位置后所需的偏移量【目的是呈现点击位置在试图上】
@param location 点击位置
*/
- (void)zoomingOffset:(CGPoint)location{
CGFloat lo_x = location.x * self.zoomScale;
CGFloat lo_y = location.y * self.zoomScale;
CGFloat off_x;
CGFloat off_y;
///off_x
if (lo_x < CGRectGetWidth(self.frame)/2) {
off_x = 0;
}
else if (lo_x > self.contentSize.width - CGRectGetWidth(self.frame)/2){
off_x = self.contentSize.width - CGRectGetWidth(self.frame);
}
else{
off_x = lo_x - CGRectGetWidth(self.frame)/2;
}
///off_y
if (lo_y < CGRectGetHeight(self.frame)/2) {
off_y = 0;
}
else if (lo_y > self.contentSize.height - CGRectGetHeight(self.frame)/2){
if (self.contentSize.height <= CGRectGetHeight(self.frame)) {
off_y = 0;
}
else{
off_y = self.contentSize.height - CGRectGetHeight(self.frame);
}
}
else{
off_y = lo_y - CGRectGetHeight(self.frame)/2;
}
[self setContentOffset:CGPointMake(off_x, off_y)];
}
#pragma mark - 重置图片
- (void)resetImageViewState{
self.zoomScale = 1;
_mainImage = nil;;
self.mainImageView.image = nil;
}
#pragma mark - 变量
- (UIImageView *)mainImageView {
if (!_mainImageView) {
_mainImageView = [UIImageView new];
_mainImageView.image = nil;
_mainImageView.contentMode = UIViewContentModeScaleAspectFit;
_mainImageView.userInteractionEnabled = YES;
}
return _mainImageView;
}
#pragma mark - 单击
- (void)tapSingleSponse:(UITapGestureRecognizer *)singleTap{
if (!self.mainImageView.image) {
return;
}
if (self.zoomScale != 1) {
[UIView animateWithDuration:0.2 animations:^{
self.zoomScale = 1;
} completion:^(BOOL finished) {
[self setContentOffset:_currPont animated:YES];
}];
}
}
#pragma mark - 双击
- (void)tapDoubleSponse:(UITapGestureRecognizer *)doubleTap{
if (!self.mainImageView.image) {
return;
}
CGPoint point = [doubleTap locationInView:self.mainImageView];
if (self.zoomScale == 1) {
[UIView animateWithDuration:0.2 animations:^{
self.zoomScale = 2.0;
[self zoomingOffset:point];
}];
}
else{
[UIView animateWithDuration:0.2 animations:^{
self.zoomScale = 1;
} completion:^(BOOL finished) {
[self setContentOffset:_currPont animated:YES];
}];
}
}
#pragma mark - UIScrollViewDelegate
- (void)scrollViewDidZoom:(UIScrollView *)scrollView {
if (!self.mainImageView.image) {
return;
}
CGRect imageViewFrame = self.mainImageView.frame;
CGFloat width = imageViewFrame.size.width,
height = imageViewFrame.size.height,
sHeight = scrollView.bounds.size.height,
sWidth = scrollView.bounds.size.width;
if (height > sHeight) {
imageViewFrame.origin.y = 0;
} else {
imageViewFrame.origin.y = (sHeight - height) / 2.0;
}
if (width > sWidth) {
imageViewFrame.origin.x = 0;
} else {
imageViewFrame.origin.x = (sWidth - width) / 2.0;
}
self.mainImageView. |