Update my Codes to iOS 6

After I updated my Xcode to 4.6, I got several compiling errors when I tried to compile my app. It seems that they are iOS 6 related.  Most of them are easy to fix. However, I had a little bit hard time to nail down two.

The first one is block related. I used self within block. In Xcode 4.6, this is a potential memory issue: Capturing 'self' strongly in this block is likely to lead to a retain cycle. With the help of SO, I quickly found the solution: using __weak prefix to capture self as none-retaining variable. Then use the var in the block.

if (entity.imagePath) {
   __weak UITableViewController *weakSelf = self;
   // Load image from entity to doc helper with handler
   [self.docHelper addImageDocs:myDoc
            withCompleteHandler:^{
                [weakSelf.tableView reloadRowsAtIndexPaths:
                   aPath
                   withRowAnimation:UITableViewRowAnimationBottom];
            }];
}

The second one was tough for me, because it is Storyboard related. The warning only indicates a potential issue but I could not locate it: table view background color is deprecated in ios 6.0. In a similar way, I got an answer from SO. But in my case, I have too many views and components. It is hard to locate the issue. Eventually, I found a way to view the storyboard as XML text and soon I located the deprecated color. I submitted my answer to SO.

References

• SO answer: Retain cycle on `self` with blocks
• My submission to OS: Is groupTableViewBackgroundColor deprecated on iOS 6?