[tabBar setSelectedIndex：2];不工作

Question

代码在ios6及以下版本正常工作，但在ios7中无效。当在标签栏之间切换视图时，应用程序会在第二次切换相同选项卡时崩溃。在delegateController中，它正在崩溃

case 1:
    {
        btnMoreSelected=NO;

        //[tabBar setSelectedIndex:0];   (here)

        [imgMore setImage:[UIImage imageNamed:@"more.png"]];
        [imgMyConnection setImage:[UIImage imageNamed:@"connect-req.png"]];
        [imgIceBreaker setImage:[UIImage imageNamed:@"my-ice-brkr.png"]];
        [imgSetting setImage:[UIImage imageNamed:@"settings-nav.png"]];
        [imgSearchView setImage:[UIImage imageNamed:@"search-hover.png"]];
        [imgSearchSeparator setHidden:YES];
        [imgSettingSeprator setHidden:NO];
        [imgIceBreakerSeparator setHidden:NO];
        [imgMyConnectionSeprator setHidden:NO];
    }
        break;

错误获取是

[_UINavigationBarBackIndicatorView frame]: message sent to deallocated instance 0x100b1180

请提前指导以上感谢。