设置tabBarItem.imageInsets后,item每点一下会变小。

GetViewController * vc1 = [[GetViewController alloc]init];
vc1.tabBarItem.image = [UIImage imageNamed:@"arriving"];
vc1.tabBarItem.selectedImage = [UIImage imageNamed:@"arriving-focus"];
vc1.tabBarItem.imageInsets = UIEdgeInsetsMake(8, 5, 2, 5);

第一个是刚进来正常,第二个是点了一下,第三个是点其他的他又变成原来的了...

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//修改图片大小和控件一致

• (UIImage )scaleImageToSize:(UIImage )img size:(CGSize)size
  {
  UIGraphicsBeginImageContext(size);
  [img drawInRect:CGRectMake(0, 0, size.width, size.height)];
  UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
  return scaledImage;
  }

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 UIEdgeInsetsMake 的top bottom left right 必须是对称的比如5，-5