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我想在我的UIViewController中添加UITabBar，我不想使用UITabBarController，因爲我需要將此視圖控制器放到導航控制器中。如何縮放TabBarItem圖片
一切都很好，只是我的UITabBarItem圖像不能縮放以適合要正確顯示的項目大小。
如何解決這個問題？
下面是一些代碼：
UITabBar *myTabBar = [[UITabBar alloc] initWithFrame:CGRectMake(0.0, barHeight, screenBounds.size.width, 50.0)];
myTabBar.opaque = YES;
UITabBarItem *barItem1 = [[UITabBarItem alloc] initWithTitle:@"title1" image:[UIImage imageNamed:@"icon1.png"] tag:1];
UITabBarItem *barItem2 = [[UITabBarItem alloc] initWithTitle:@"title2" image:[UIImage imageNamed:@"icon2.png"] tag:2];
UITabBarItem *barItem3 = [[UITabBarItem alloc] initWithTitle:@"title3" image:[UIImage imageNamed:@"icon3.png"] tag:3];
UITabBarItem *barItem4 = [[UITabBarItem alloc] initWithTitle:@"title4" image:[UIImage imageNamed:@"icon4.png"] tag:4];
NSArray *tbItems = [NSArray arrayWithObjects:barItem1, barItem2, barItem3, barItem4, nil];
myTabBar.items = tbItems;