我正在尝试将点按的图像保存到相册,使用contentOffset来检测点击要保存的图像对象,但它总是保存最后一个imageObject。
以下是我在scrollView中尝试计算tapped图像视图的contentOffset的方法:
(void)viewDidLoad
{
UIScrollView *imageScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
imageScrollView.delegate = self;
imageScrollView.pagingEnabled = YES;
for (int i = 0; i < 61; i++) {
CGFloat xOrigin = i * 320;
UIButton *myButton = [UIButton buttonWithType:UIButtonTypeCustom];
[myButton addTarget:self action:@selector(dismissView:) forControlEvents:UIControlEventTouchUpInside];
myButton.frame = CGRectMake(xOrigin, 10, 60, 35);
[myButton.layer setMasksToBounds:YES];
[myButton.layer setCornerRadius:10.0f];
myButton.layer.borderWidth = 2;
myButton.layer.borderColor = [[UIColor whiteColor] CGColor];
[myButton setTitle:@"Done" forState:UIControlStateNormal];
myButton.backgroundColor = [UIColor clearColor];
NSString *imageName = [NSString stringWithFormat:@"image%d.png", i];
UIImage *image = [UIImage imageNamed:imageName];
_imageView = [[[UIImageView alloc] initWithImage:image]autorelease];
_imageView.frame = CGRectMake(xOrigin, 0, 320, 480);
_imageView.tag = i;
[_imageScrollView viewWithTag:i+1];
UILongPressGestureRecognizer *gestureRecognizer = [[UILongPressGestureRecognizer alloc]
initWithTarget:self
action:@selector(handleLongPress:)];
imageScrollView.userInteractionEnabled = YES;
[imageScrollView addGestureRecognizer:gestureRecognizer];
gestureRecognizer.delegate = self;
[gestureRecognizer release];
[imageScrollView addSubview:_imageView];
[imageScrollView addSubview:myButton];
}
imageScrollView.contentSize = CGSizeMake(320 * 61 , 480);
[self.view addSubview:imageScrollView];
}
- (void)handleLongPress:(UILongPressGestureRecognizer*)gestureRecognizer{
if (gestureRecognizer.state == UIGestureRecognizerStateBegan){
UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"Save Photo", nil];
actionSheet.actionSheetStyle = UIActionSheetStyleBlackTranslucent;
[actionSheet showInView:self.view];
[actionSheet release];
}}
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
switch (buttonIndex) {
case 0:
[self performSelector:@selector(LongPress:) withObject:nil];
break;
default:
break;
}}
- (void)LongPress:(UILongPressGestureRecognizer*)gestureRecognizer{
CGPoint offset = _imageScrollView.contentOffset;
int imageView = floor((Offset.x - imageView / 320) / imageView) + 1;
UIImage* image = [(UIImageView*)[_imageScrollView viewWithTag:imageView] image];
UIImageWriteToSavedPhotosAlbum(image, self, @selector(image: didFinishSavingWithError:contextInfo:), nil);
}
我希望此代码能够保存已点按的图片,但它会保留滚动视图中的最后一个图片视图。
如果我做得不对,请告诉我,如果我仍然遗失某些东西。谢谢你的帮助。
答案 0 :(得分:1)
原因在于您正在使用的viewDidLoad
_image = [UIImage imageNamed:imageName];
我认为这是班级中的全局变量,您正在使用此对象将图像保存到相册。由于它是循环最后一次计数的全局变量,因此图像将指向它,因此您始终会保存最后一张图像。
您可以通过for循环中的_image
本地修复它。当您设置标签时,使用标签可以从scrollView获取imageView / image。你可以喜欢这个
//your imageView in longPress function has the selected imageView's tag
UIImage* selImage = [(UIImageView*)[imageScrollView viewWithTag:imageView] image];
这应该适合你。
答案 1 :(得分:1)
int imageView = floor((Offset.x - imageView / 320) / imageView) + 1;
通过这一行
int imageView = (int)(scrollView.contentOffset.x / scrollView.frame.size.width);