iOS UITabBarItem Image selected x消失 Xcode 6

[(UITabBarItem*)[[[self
tabBar] items]
objectAtIndex:0]
setImage:[UIImage
imageNamed:@"tabbar_trends_nomal"]];
[(UITabBarItem*)[[[self
tabBar] items]
objectAtIndex:0]
setSelectedImage:[UIImage
imageNamed:@"tabbar_trends_selected"]];

[(UITabBarItem*)[[[self
tabBar] items]
objectAtIndex:1]
setImage:[UIImage
imageNamed:@"tabbar_channel_nomal"]];
[(UITabBarItem*)[[[self
tabBar] items]
objectAtIndex:1]
setSelectedImage:[UIImage
imageNamed:@"tabbar_channel_selected"]];

[(UITabBarItem*)[[[self
tabBar] items]
objectAtIndex:2]
setImage:[UIImage
imageNamed:@"tabbar_message_nomal"]];
[(UITabBarItem*)[[[self
tabBar] items]
objectAtIndex:2]
setSelectedImage:[UIImage
imageNamed:@"tabbar_message_selected"]];

[(UITabBarItem*)[[[self
tabBar] items]
objectAtIndex:3]
setImage:[UIImage
imageNamed:@"tabbar_me_nomal"]];
[(UITabBarItem*)[[[self
tabBar] items]
objectAtIndex:3]
setSelectedImage:[UIImage
imageNamed:@"tabbar_me_selected"]];