UITabBarItem 更改图像的高度和宽度／UINavigationBar 更改样式

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从苹果文档的最大大小的一张图片在 TabBar 是 30 x 30 (60 x 60 的视网膜显示器）。

我不认为它是可能采取整个 TabBar 不拉伸图像的高度。我认为最好的解决办法是中心中使用 imageInset TabBar 的图像

tabBarItem1.imageInsets = UIEdgeInsetsMake(6, 0, -6, 0);

enter image description here

否则你可以玩这 imageInset 和拉伸图像像在截图中

tabBarItem1.imageInsets = UIEdgeInsetsMake(0, -10, -6, -10);

enter image description here

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions  { UITabBarController *tabBarController = (UITabBarController *)self.window.rootViewController; UITabBar *tabBar = tabBarController.tabBar; UITabBarItem *tabBarItem1 = [tabBar.items objectAtIndex:0]; UITabBarItem *tabBarItem2 = [tabBar.items objectAtIndex:1]; UITabBarItem *tabBarItem3 = [tabBar.items objectAtIndex:2]; //add image to tabbarItems tabBarItem1.imageInsets = UIEdgeInsetsMake(0, -10, -6, -10);}

[[UINavigationBarappearance] setTintColor:[UIColorwhiteColor]];

NSShadow *shadow = [[NSShadowalloc] init];

shadow.shadowColor = [UIColorcolorWithRed:0.0green:0.0blue:0.0alpha:0.0];

shadow.shadowOffset =CGSizeMake(0,1);

// [UIColor colorWithRed:245.0/255.0 green:245.0/255.0 blue:245.0/255.0 alpha:1.0]

[[UINavigationBarappearance] setTitleTextAttributes: [NSDictionarydictionaryWithObjectsAndKeys:

[UIColorgrayColor], NSForegroundColorAttributeName,

shadow,NSShadowAttributeName,

[UIFontfontWithName:@"Avenir-Medium" size:20.0],NSFontAttributeName, nil]];

UIBarButtonItem *cameraItem = [[UIBarButtonItemalloc] initWithImage:[selfscaleImageToSize:[UIImageimageNamed:@"ico_location_up"] size:CGSizeMake(20,26)] style:UIBarButtonItemStyleBorderedtarget:selfaction:@selector(do)];

self.navigationItem.leftBarButtonItem = cameraItem;

//修改图片大小和控件一致

- (UIImage *)scaleImageToSize:(UIImage *)img size:(CGSize)size

{

UIGraphicsBeginImageContext(size);

[imgdrawInRect:CGRectMake(0,0, size.width, size.height)];

UIImage* scaledImage =UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return scaledImage;

}

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