ios 从标签号中获取标签
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ios get label from tag number
提问by J Max
I want to get a label's attributes from self so I tried:
我想从 self 获取标签的属性，所以我尝试了：
UILabel *label = (UILabel *)[self viewWithTag:1];
But all I got was an empty UILabel instead of the label I was looking for. What is correct way to do this.
但我得到的只是一个空的 UILabel 而不是我正在寻找的标签。什么是正确的方法来做到这一点。
回答by J Max
So I figured out what I was doing wrong. Obviously
所以我想出了我做错了什么。明显地
UILabel *label = (UILabel *)[self viewWithTag:1];
creates a pointer to the instance of my label with tag 1. This does actually work. What doesn't work and why I was having problems came from trying to release label. Releasing labelis the same as release [self viewWithTag:1] which is not what I was trying to do.
创建一个指向我的标签实例的指针，标签为 1。这确实有效。什么不起作用以及为什么我遇到问题来自试图发布label。释放标签与释放 [self viewWithTag:1] 相同，这不是我想要做的。
回答by Nikhlesh Bagdiya
In Objective Cfor getting UILabel in UIViewController by tag.
在Objective C 中，通过标签获取 UIViewController 中的 UILabel。
here i take assumption as your UILabelis added on self.view, otherwise you can pass your view where you added UILabelas [yourview viewWithTag:1];
在这里，我假设您UILabel已添加self.view，否则您可以在添加UILabel为的地方传递您的视图[yourview viewWithTag:1];
UILabel *label = (UILabel *)[self.view viewWithTag:1];
In UITableView
在 UITableView
UILabel *label = (UILabel *)[cell viewWithTag:1];
cell is a object of UITableViewCellas
单元格是UITableViewCellas的对象
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];
In Swift 3
在斯威夫特 3
let label:UILabel = self.view.viewWithTag(1) as! UILabel
In UITableView
在 UITableView
let cell:UITableViewCell = self.tableView.dequeueReusableCell(withIdentifier: "Cell") as UITableViewCell!
let label:UILabel = cell.viewWithTag(1) as! UILabel
NOTE:before using tag (viewWithTag) there should be object (UILabel) with that tag number, otherwise app is crash.
注意：在使用标签 (viewWithTag) 之前，应该有带有该标签编号的对象 (UILabel)，否则应用程序会崩溃。
you can set tag for any object via storyboard or via XIB and programatically.
您可以通过故事板或通过 XIB 以编程方式为任何对象设置标签。
回答by Kevin ABRIOUX
For Swift 3, when i am in a view controller, i have to call this code to retrieve a view by tag :
对于 Swift 3，当我在视图控制器中时，我必须调用此代码以按标签检索视图：
self.mInstructionView = self.view.viewWithTag(1)
