创建类似iPhone的照片库，但UIImage点击事件处理程序不起作用

Question

Hi i am new to iOS programming. I need to create an photo library like iPhone native photo app. I have found a library MWPhotoBrowser that provides nearly same UI for photo browsing and its perfect for my requirement. But now i have 2 problems

First is that i need to create a grid layout with thumbnails. Clicking on an thumbnail should display image in full screen with browsing functionality. I tried to dynamically adding UIImageViews in UIScrollView , but UIScrollView is not scrolling and images are going out of screen.

Second is i could not get any tap handler on UIImageView so that i can open an image in full screen. Looking for some tips here, i am really stuck here.

Answer 1

You can give a shot to this library, it has both features which you are looking for.

https://github.com/gdavis/FGallery-iPhone

Hope it helps :)

Answer 2

For ScrollView scrolling issue you have to increase scrlViewMain.contentSize dynamically. Create a for loop and put bellow code at the end of loop.

scrlViewMain.contentSize = CGSizeMake(0, incermentAsPerYourNeed);

For the tapping issue you have to add TapGesture . Put bellow code when your ImageView creates.

   imgView.tag = giveAsPerYourRecordsID;
   UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleImageTap:)];
   tap.cancelsTouchesInView = YES;
   tap.numberOfTapsRequired = 1;
   tap.delegate = self;
   [imgView addGestureRecognizer:tap];
   [tap release];

And bellow your catch method for tapping.

- (void) handleImageTap:(UIGestureRecognizer *)gestureRecognizer {
     UIImageView *tmpImgView = (UIImageView *)gestureRecognizer.view;
}

Answer 3

I have also developed similar functionality a few days ago for my project. For tap issue you should use UIButton instead of UIImageView , it gives you tap action event. For Scrollview not scrolling, just make sure you update contentSize property of UIScrollView , otherwise it would not scroll according to your subviews.