iOS栏项目图像显示错误的颜色

Question

I have a bar with Bar Items, my .png image has green color, but when i add it to storyboard it's displaying as blue.

How can i make it display the image as it is?

Answer 1

Use tintColor of UIBarButton to set the desired color for the image. If its absolutely necessary to use original image colors, use this to set the image:

[aBarButton setImage:[[UIImage imageNamed:@"xyz.png"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]];

Answer 2

The docs are a little ambiguous about this

The images displayed on the bar are derived from this image. If this image is too large to fit on the bar, it is scaled to fit. Typically, the size of a toolbar and navigation bar image is 20 x 20 points. The alpha values in the source image are used to create the images—opaque values are ignored.

Essentially what this is saying is the image you supply will not be what is actually displayed. Instead the system uses the alpha mask of the image and the tintColor of the item to generate the final display.

Answer 3

add image programmatically

[button setImage:[[UIImage imageNamed:@"imageName.png"]   imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]     forState:UIControlStateNormal];

if its not work then try this:-

UIImage *myImage = [UIImage imageNamed:@"myImageFile.png"];
myImage = [myImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
UIBarButtonItem *menuButton = [[UIBarButtonItem alloc] initWithImage:myImage   style:UIBarButtonItemStylePlain target:self action:@selector(menuObject:)];
self.navigationItem.leftBarButtonItem = menuButton;

if its not work then try this:-

#define setTurqoiseColor [UIColor colorWithRed:68.0f/255.0f green:181.0f/255.0f blue:223.0f/255.0f alpha:1.0]

UIBarButtonItem *menuButton = [[UIBarButtonItem alloc] initWithImage:buttonImage style:UIBarButtonItemStyleBordered target:self  action:@selector(toggleMenu)];
menuButton.tintColor = setTurqoiseColor;

Answer 4

To set tint color of bar item global, in your App Delegate, add these lines of code

UIBarButtonItem *barButtonAppearance = [UIBarButtonItem appearance];
[barButtonAppearance setTintColor:[UIColor redColor]]; // set to your color
[[UIBarButtonItem appearance] setTintColor:[UIColor redColor]];

Answer 5

You have to set your UITabBar tintColor.

If you would like to add a custom color / gradient you can set your tabBarItem image and selectedImage property as follow:

 customTabBarItem.selectedImage = UIImage(named: "customSelectedImage")!.imageWithRenderingMode(.AlwaysOriginal)
 customTabBarItem.image = UIImage(named: "customUnselectedImage")!.imageWithRenderingMode(.AlwaysOriginal)