UIImage颜色改变了吗? [英] UIImage color changing?

问题描述

如何通过编程更改UIImage的颜色，请帮忙?如果我发送UIImage，它的颜色需要更改任何帮助吗?如果我通过位图处理更改RGB颜色，则它将不起作用.

How can I change the UIImage's color through programming, any help please? If I send a UIImage, its color needs to change any help please? If I change the RGB color through bitmaphandling, it does not work.

推荐答案

如果只需要让它与众不同，只需使用imageView.tintColor(iOS 7+).抓住的是，设置tintColor在默认情况下不执行任何操作:

If you only need it to look different, just use imageView.tintColor (iOS 7+). Catch is, setting tintColor doesn't do anything by default:

要使其正常运行，请使用imageWithRenderingMode:

To make it work, use imageWithRenderingMode:

var image = UIImage(named: "stackoverflow")!
image = image.imageWithRenderingMode(.AlwaysTemplate)

let imageView = ...
imageView.tintColor = UIColor(red: 0.35, green: 0.85, blue: 0.91, alpha: 1)
imageView.image = image

现在它将起作用:

到文档的链接.

性能

在配置UIImageView之后设置图像可以避免重复昂贵的操作:

Setting the image after configuring the UIImageView avoids repeating expensive operations:

// Good usage
let imageView = ...
imageView.tintColor = yourTintColor
var image = UIImage(named: "stackoverflow")!
image = image.imageWithRenderingMode(.AlwaysTemplate)
imageView.image = image        // Expensive

// Bad usage
var image = UIImage(named: "stackoverflow")!
image = image.imageWithRenderingMode(.AlwaysTemplate)
let imageView = ...
imageView.image = image        // Expensive
imageView.frame = ...          // Expensive
imageView.tintColor = yourTint // Expensive

获取&异步设置图像可减少滚动和动画滞后(尤其是在UICollectionViewCell或UITableViewCell内部着色图像时):

Getting & setting the image asynchronously reduces scrolling and animation lag (especially when tinting an image inside of a UICollectionViewCell or UITableViewCell):

let imageView = cell.yourImageView
imageView.image = nil // Clear out old image
imageView.tintColor = UIColor(red: 0.35, green: 0.85, blue: 0.91, alpha: 1)

// Setting the image asynchronously reduces stuttering 
// while scrolling.  Remember, the image should be set as
// late as possible to avoid repeating expensive operations
// unnecessarily.
dispatch_async(dispatch_get_main_queue(), { () -> Void in
    var image = UIImage(named: "stackoverflow")!
    image = image.imageWithRenderingMode(.AlwaysTemplate)
    imageView.image = image
})

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