ios 如何向导航栏添加/使用默认图标
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How to add / use default icons to navigation bar
提问by pbaranski
I want to use some of default iOS iconsi.e.
我想使用一些默认的iOS 图标，即
in navigation bar.
Basically I don't know how to call image of that item (directly from native library - I know how to download it and place as custom image:)):
在导航栏中。
基本上我不知道如何调用该项目的图像（直接从本机库 - 我知道如何下载它并放置为自定义图像:)）：
var myButton:UIButton = UIButton.buttonWithType(UIButtonType.Custom) as! UIButton
myButton.addTarget(self, action: "reload", forControlEvents: UIControlEvents.TouchUpInside)
myButton.setImage(???, forState: <#UIControlState#>)
回答by Dharmesh Kheni
You can use UIBarButtonSystemItemthis way:
你可以这样使用UIBarButtonSystemItem：
let button = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Refresh, target: self, action: "someAction")
navigationItem.leftBarButtonItem = button
Result for leftBarButtonItem:
结果为leftBarButtonItem：
If you want to set it at right side you can use this code:
如果您想将其设置在右侧，您可以使用以下代码：
navigationItem.rightBarButtonItem = button
Result for rightBarButtonItem:
结果为rightBarButtonItem：
回答by Nitin Nain
Swift:These are the most commonly used options:
Swift：这些是最常用的选项：
To Use custom image with original colour:
要使用具有原始颜色的自定义图像：
let customImageBarBtn1 = UIBarButtonItem(
UIImage(named: "someImage.png").withRenderingMode(.alwaysOriginal),
style: .plain, target: self, action: #selector(handleClick))
To Use custom image with tint colour:
要使用带有色调的自定义图像：
let customImageBarBtn2 = UIBarButtonItem(
UIImage(named: "someImage.png").withRenderingMode(.alwaysTemplate),
style: .plain, target: self, action: #selector(handleClick))
Or use system provided buttons:
或者使用系统提供的按钮：
let systemBarBtn = UIBarButtonItem(
barButtonSystemItem: .search,
target: self, action: #selector(handleClick))
Then add any one of these buttons to the navigationItem:
然后将这些按钮中的任何一个添加到导航项中：
navigationItem.leftBarButtonItems = [customImageBarBtn1, customImageBarBtn2]
navigationItem.rightBarButtonItems = [systemBarBtn]
// OR you can use this if there's only one item.
navigationItem.rightBarButtonItem = systemBarBtn
For custom Images:As a starting size, 22ptx22ptimages work well for the default iPhone Navigation Bar size.
对于自定义图像：作为起始尺寸，22ptx22pt图像适用于默认的 iPhone 导航栏尺寸。
回答by Sanjay Mishra
In swift 4.3
在快速 4.3
let btnRefresh = UIBarButtonItem(barButtonSystemItem: UIBarButtonItem.SystemItem.refresh, target: self, action: #selector(targeted function to invoke))
//If you want icon in left side
navigationItem.leftBarButtonItem = btnRefresh
//If you want icon in right side
navigationItem.rightBarButtonItem = btnRefresh
