问题
As per Apple docs
I'm trying to set custom finished selected and unselected images on a UITabBarItem like so:
...
DetailViewController *vc1 = [[DetailViewController alloc] initWithNibName:@"DetailView" bundle:nil];
UITabBarItem *vc1i = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemTopRated tag:100];
[vc1i setFinishedSelectedImage:[UIImage imageNamed:@"tab_bar_item_selected.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"tab_bar_item_normal.png"]];
[vc1 setTabBarItem:vc1i];
...
Basically what's happening is the TabBar loads up just fine, it just completely ignores the tab bar item customization.
I'm targeting iOS5+
The images are 30x30 transparent PNGs and exist in the project. Can't figure out what I'm overlooking here, but must be something!
This is being called in the tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath method, ala Ray Wenderlich's tutorial
Anyone have any ideas?
Thanks!
回答1:
The tab bar item is initialized with the method: initWithTabBarSystemItem:tag:. But, as the documentation says:
This method returns a system-supplied tab bar item. The title and image properties of the returned item cannot be changed later.
You should initialize the tab bar item with initWithTitle:image:tag:.
UITabBarItem *vc1i = [[UITabBarItem alloc] initWithTitle:@"Top Rated" image:nil tag:100];
[vc1i setFinishedSelectedImage:[UIImage imageNamed:@"tab_bar_item_selected.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"tab_bar_item_normal.png"]];
回答2:
If your are trying to achieve displaying of the actual image at the UITabBar then use the following code.
[yourTabBarItem setImage:[[UIImage imageNamed:@"more.png"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]];
and if you want to display image in original condition for the selected then use the following
[yourTabBarItem setSelectedImage:[[UIImage imageNamed:@"more.png"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]];
these two are alternative to
setFinishedSelectedImage: withFinishedUnselectedImage:
来源：https://stackoverflow.com/questions/8547669/ios-5-uitabbaritem-setfinishedselectedimagewithfinishedunselectedimage-not-wo