It looks like the view hierarchy changed slightly in ios7 for table view cells.
You can try setting the clips to bounds on the contentView's superview:
[cell.contentView.superview setClipsToBounds:NO];If you add the following to your sample code and run on ios7 vs ios6, you'll see there's an additional view between the cell view and content view:
[cell.contentView.superview setClipsToBounds:NO];
NSLog(@"%@", cell.contentView.superview);
NSLog(@"%@", cell.contentView.superview.superview);
NSLog(@"%@", cell);
if(self.view.clipsToBounds){
NSLog(@"Master clips");
}else{
NSLog(@"Master no clip");
}
参考：http://stackoverflow.com/questions/18877895/how-to-stop-uitableview-from-clipping-uitableviewcell-contents-in-ios-7