ios 导航栏按钮图像
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/28299433/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Navigation bar button image
提问by Jason
I am using this code to get a logo on my nav bar.
我正在使用此代码在我的导航栏上获取徽标。
override func viewDidAppear(animated: Bool) {
let image = UIImage(named: "LogoWithTextSmaller.png")
self.navigationItem.leftBarButtonItem = UIBarButtonItem(image: image, style: UIBarButtonItemStyle.Plain, target: nil, action: nil)
}
This is fine, but the logo doesn't have any colour - besides 'blue'. Is it because it is a png file. Is there something I can so it retains the original colours
这很好，但徽标没有任何颜色 - 除了“蓝色”。是不是因为它是一个png文件。有什么我可以的，所以它保留了原来的颜色
I have done this:
我已经这样做了：
self.navigationItem.titleView = UIImageView(image: image)
and that brings the image onto the nav bar with the correct colours - but it's in the middle and I want it on the left.
这会将图像以正确的颜色带到导航栏上 - 但它在中间，我希望它在左边。
回答by bhavik shah
You need to declare that the image stays original all the time. so add the code as below
您需要声明图像始终保持原始状态。所以添加如下代码
var image = UIImage(named: "image-name")
image = image?.withRenderingMode(.alwaysOriginal)
self.navigationItem.leftBarButtonItem = UIBarButtonItem(image: image, style:.plain, target: nil, action: nil)
回答by CoderJimmy
In Swift 3the same would be accomplished using the following syntax
在Swift 3 中，同样可以使用以下语法完成
var image = UIImage(named: "Filter")
image = image?.withRenderingMode(UIImageRenderingMode.alwaysOriginal)
self.navigationItem.rightBarButtonItem = UIBarButtonItem(image:image , style: UIBarButtonItemStyle.plain, target: nil, action: nil)
回答by Ashish
Swift 3.0
斯威夫特 3.0
let btnLogo = UIButton(frame: CGRect(x: 0, y: 0, width: 25, height: 25))
btnLogo.setTitle("", for: .normal)
btnLogo.backgroundColor = UIColor.clear
btnLogo.layer.cornerRadius = 4.0
btnLogo.layer.masksToBounds = true
var imageLogo = UIImage(named: "LogoWithTextSmaller.png")
imageLogo = imageLogo?.withRenderingMode(UIImageRenderingMode.alwaysOriginal)
btnLogo.setImage(imageLogo, for: .normal)
let barButton = UIBarButtonItem(customView: btnLogo)
self.navigationItem.leftBarButtonItem = barButton
swift 2.0
快速 2.0
var image = UIImage(named: "Filter")
image = image?.imageWithRenderingMode(UIImageRenderingMode.alwaysOriginal)
Objective-C
目标-C
UIImage *image = [[UIImage alloc] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
UIBarButtonItem *_btnLeftBar = [[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"LogoWithTextSmaller.png"]
style:UIBarButtonItemStylePlain
target:self
action:@selector(yourMethod)];
self.navigationItem.rightBarButtonItem= _btnLeftBar;
For withRenderingMode(_:) details see below apple documentation link https://developer.apple.com/documentation/uikit/uiimage/1624153-withrenderingmode
有关 withRenderingMode(_:) 详细信息，请参阅下面的苹果文档链接 https://developer.apple.com/documentation/uikit/uiimage/1624153-withrenderingmode
回答by ronak patel
In swift 3.0
在快速 3.0
let Navigateimage = UIImage(named: "LogoWithTextSmaller.png")
Navigateimage = Navigateimage?.withRenderingMode(.alwaysOriginal)
self.navigationItem.leftBarButtonItem = UIBarButtonItem(image: Navigateimage, style:.plain, target: nil, action: nil)
回答by Jerome
Swift 3If the item is missing, you can try this.
Swift 3如果物品丢失，你可以试试这个。
let navigationBar = navigationController?.navigationBar
let topItem = navigationBar?.topItem
var navigateimage = UIImage(named: "addConnectionFromSupport")
navigateimage = navigateimage?.withRenderingMode(.alwaysOriginal)
topItem?.rightBarButtonItem = UIBarButtonItem(image: navigateimage, style:.plain, target: nil, action: nil)
回答by S. Bharti
SWIFT 4
快速 4
let back = UIImage(named: "back_white")?.withRenderingMode(.alwaysOriginal)
self.navigationItem.leftBarButtonItem = UIBarButtonItem(image: back, style:.plain, target: nil, action: nil)
