Ios 检测用户是否点击了UIImageView
我试图实现的是创建一个功能，当用户单击图像时，它会推送到navController中的下一个VC 在ViewDidLoad中：Ios 检测用户是否点击了UIImageView,ios,uigesturerecognizer,Ios,Uigesturerecognizer,我试图实现的是创建一个功能，当用户单击图像时，它会推送到navController中的下一个VC 在ViewDidLoad中： UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTapAction:)]; [singleTap setNumberOfTapsRequired:1]; [singleTap setNumberOf
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTapAction:)];
[singleTap setNumberOfTapsRequired:1];
[singleTap setNumberOfTouchesRequired:1];
[self.scroll addGestureRecognizer:singleTap];
- (void)singleTapAction:(UIGestureRecognizer *)singleTap {
UIView *view = singleTap.view;
if([view isKindOfClass:[UIImageView class]]){
NSLog(@"tapped on image");
}
else{
NSLog(@"Just tapped");
}
}
(lldb) po view;
$0 = 0x1f5ed6e0 <UIScrollView: 0x1f5ed6e0; frame = (0 0; 320 416); clipsToBounds = YES; autoresize = W+H; gestureRecognizers = <NSArray: 0x1f5edc20>; layer = <CALayer: 0x1f5ecb80>; contentOffset: {0, 0}>
ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init];
[assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos
usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
if (nil != group) {
// be sure to filter the group so you only get photos
[group setAssetsFilter:[ALAssetsFilter allPhotos]];
NSLog(@"%d images found", group.numberOfAssets);
// for(int i = group.numberOfAssets - 5; i<group.numberOfAssets - 1; i++){
dispatch_apply(4, dispatch_get_global_queue(0, 0), ^(size_t i){
[group enumerateAssetsAtIndexes:[NSIndexSet indexSetWithIndex:i]
options:0
usingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
if (nil != result) {
ALAssetRepresentation *repr = [result defaultRepresentation];
// this is the most recent saved photo
UIImage *img = [self fixrotation:[UIImage imageWithCGImage:[repr fullResolutionImage]]];
UIImageOrientation orient = img.imageOrientation;
NSLog(@"orientation: %d", orient);
CGFloat aspectRatio = img.size.width/img.size.height;
UIImageView *imgView = [[UIImageView alloc] init];
imgView.frame = CGRectMake(10, self.yCord, 300, 300 /aspectRatio);
self.yCord += margin + (300/aspectRatio);
imgView.image = img;
imgView.layer.shadowRadius = 5.0;
imgView.layer.shadowColor = [UIColor blackColor].CGColor;
imgView.layer.cornerRadius = 4.0;
[imgView setUserInteractionEnabled:YES];
[self.scroll addSubview:imgView];
NSLog(@"%@", imgView);
NSLog(@"%f, %f, %f, %f", imgView.frame.origin.x, imgView.frame.origin.y, imgView.frame.size.width, imgView.frame.size.height);
*stop = YES;
self.scrollViewHeight = self.yCord + imgView.frame.size.height + margin;
CGSize scrollViewSize = CGSizeMake(320, self.scrollViewHeight);
[self.scroll setContentSize:scrollViewSize];
//self.scroll.frame = CGRectMake(0,0, 320, self.scrollViewHeight);
}
}];
});
}
*stop = NO;
} failureBlock:^(NSError *error) {
NSLog(@"error: %@", error);
}];
您应该为每个图像视图单独创建并附加一个点击手势，而不是将其添加到容器视图中。为什么不使用UIButton 您可以为按钮设置自定义图像 这样，按钮就可以为您处理点击事件，而不是编写自己的点击手势处理程序 我注意到在您的代码中，您有： UIView*view=手势.view 您是否尝试将其更改为： UIImageView*视图=手势。视图
顺便说一句，当您将图像添加到scrollview时，您可能希望立即将点击手势识别器添加到该图像中，而不是将其添加到scrollview中。为什么不改用UIButton 您可以为按钮设置自定义图像 这样，按钮就可以为您处理点击事件，而不是编写自己的点击手势处理程序 我注意到在您的代码中，您有： UIView*view=手势.view 您是否尝试将其更改为： UIImageView*视图=手势。视图
顺便说一下，当您将图像添加到scrollview中时，您可能希望立即将点击手势识别器添加到该图像中，而不是将其添加到scrollview中。为什么不在ImageView中添加点击手势而不是 正在添加滚动 并编写代码
[self.imageView setUserInteractionEnabled:YES];
为什么不在ImageView上添加点击手势而不是 正在添加滚动 并编写代码
[self.imageView setUserInteractionEnabled:YES];
您可以检测触摸是否在图像视图中，如下所示
- (void)singleTapAction:(UIGestureRecognizer *)singleTap {
CGPoint touchPoint = [singleTap locationInView:self.scroll];
if(CGRectContainsPoint(self.tappableImageView.frame, touchPoint){
NSLog(@"tapped on image");
}
else{
NSLog(@"Just tapped");
}
}
- (void)singleTapAction:(UIGestureRecognizer *)singleTap {
CGPoint touchPoint = [singleTap locationInView:self.scroll];
UIImageView *theTappedView;
for (UIView *subView in [self.scroll subViews]) {
if(CGRectContainsPoint(self.tappableImageView.frame, touchPoint)
&& [subView isKindOfClass:[UIImageView class]]) {
theTappedView = subView;
break;
}
}
if(theTappedView != nil){
NSLog(@"tapped on image");
}
else{
NSLog(@"Just tapped");
}
}
- (void)singleTapAction:(UIGestureRecognizer *)singleTap {
CGPoint touchPoint = [singleTap locationInView:self.scroll];
if(CGRectContainsPoint(self.tappableImageView.frame, touchPoint){
NSLog(@"tapped on image");
}
else{
NSLog(@"Just tapped");
}
}
- (void)singleTapAction:(UIGestureRecognizer *)singleTap {
CGPoint touchPoint = [singleTap locationInView:self.scroll];
UIImageView *theTappedView;
for (UIView *subView in [self.scroll subViews]) {
if(CGRectContainsPoint(self.tappableImageView.frame, touchPoint)
&& [subView isKindOfClass:[UIImageView class]]) {
theTappedView = subView;
break;
}
}
if(theTappedView != nil){
NSLog(@"tapped on image");
}
else{
NSLog(@"Just tapped");
}
}
这假设将点击的所有图像视图都是self.scroll scroll视图的子视图。您可以检测触摸是否在图像视图内，如下图所示
- (void)singleTapAction:(UIGestureRecognizer *)singleTap {
CGPoint touchPoint = [singleTap locationInView:self.scroll];
if(CGRectContainsPoint(self.tappableImageView.frame, touchPoint){
NSLog(@"tapped on image");
}
else{
NSLog(@"Just tapped");
}
}
- (void)singleTapAction:(UIGestureRecognizer *)singleTap {
CGPoint touchPoint = [singleTap locationInView:self.scroll];
UIImageView *theTappedView;
for (UIView *subView in [self.scroll subViews]) {
if(CGRectContainsPoint(self.tappableImageView.frame, touchPoint)
&& [subView isKindOfClass:[UIImageView class]]) {
theTappedView = subView;
break;
}
}
if(theTappedView != nil){
NSLog(@"tapped on image");
}
else{
NSLog(@"Just tapped");
}
}
- (void)singleTapAction:(UIGestureRecognizer *)singleTap {
CGPoint touchPoint = [singleTap locationInView:self.scroll];
if(CGRectContainsPoint(self.tappableImageView.frame, touchPoint){
NSLog(@"tapped on image");
}
else{
NSLog(@"Just tapped");
}
}
- (void)singleTapAction:(UIGestureRecognizer *)singleTap {
CGPoint touchPoint = [singleTap locationInView:self.scroll];
UIImageView *theTappedView;
for (UIView *subView in [self.scroll subViews]) {
if(CGRectContainsPoint(self.tappableImageView.frame, touchPoint)
&& [subView isKindOfClass:[UIImageView class]]) {
theTappedView = subView;
break;
}
}
if(theTappedView != nil){
NSLog(@"tapped on image");
}
else{
NSLog(@"Just tapped");
}
}
这假设将点击的所有图像视图都是self.scroll scrollView的子视图。之所以会出现这种情况，是因为您向scrollView添加了手势。还要确保您的imageview已启用UserInteraction。这是因为您向scrollview添加了手势。还要确保您的imageview已启用用户交互。这是一种攻击。我的应用程序是关于图像编辑的。可能会在以后的阶段产生问题。这是一种黑客行为。我的应用程序是关于图像编辑的。可能会在以后产生问题。实际上，我正在这样做。但是图像是在GCD块中填充的，我必须测试它在块中是否有效。实际上，我正在这样做。但是图像是在GCD块中填充的，我必须测试它在块中是否有效。我正在编辑问题并在创建ImageView的地方添加块，你能看看这是否正确吗？我正在编辑问题并在创建ImageView的地方添加块，你能看看这是不是正确的方法吗