我怎么能在多行分割字符串,如下面?
var text:String = "This is some text
over multiple lines"
我怎么能在多行分割字符串,如下面?
var text:String = "This is some text
over multiple lines"
当前回答
一种方法是将标签文本设置为attributedText,并更新字符串变量以包含换行符的HTML (<br />)。
例如:
var text:String = "This is some text<br />over multiple lines"
label.attributedText = text
输出:
This is some text
over multiple lines
希望这能有所帮助!
其他回答
加上@Connor的回答,也需要有\n。以下是修改后的代码:
var text:String = "This is some text \n" +
"over multiple lines"
Swift 4通过提供多行字符串文字支持解决了这个问题。要开始字符串字面量,添加三个双引号(" " " ")并按回车键,按回车键后开始写带有任何变量的字符串,换行符和双引号,就像你在记事本或任何文本编辑器中写的那样。要结束多行字符串文字再次写入(" " ")在新行。
参见下面的例子
let multiLineStringLiteral = """
This is one of the best feature add in Swift 4
It let’s you write “Double Quotes” without any escaping
and new lines without need of “\n”
"""
print(multiLineStringLiteral)
下面是一个代码片段,用n个字符分隔字符串:
//: A UIKit based Playground for presenting user interface
import UIKit
import PlaygroundSupport
class MyViewController : UIViewController {
override func loadView() {
let str = String(charsPerLine: 5, "Hello World!")
print(str) // "Hello\n Worl\nd!\n"
}
}
extension String {
init(charsPerLine:Int, _ str:String){
self = ""
var idx = 0
for char in str {
self += "\(char)"
idx = idx + 1
if idx == charsPerLine {
self += "\n"
idx = 0
}
}
}
}
迅速:
@connor是正确答案,但如果你想在打印语句中添加行,你要寻找的是\n和/或\r,这些被称为转义序列或转义字符,这是一个关于该主题的Apple文档链接。
例子:
print("First line\nSecond Line\rThirdLine...")
正如litso所指出的,在一个表达式中重复使用+-操作符会导致Xcode Beta挂起(刚刚用Xcode 6 Beta 5检查过):Xcode 6 Beta无法编译
目前,多行字符串的另一种替代方法是使用一个字符串数组,并将其压缩为+:
var text = ["This is some text ",
"over multiple lines"].reduce("", +)
或者,可以更简单地使用join:
var text = "".join(["This is some text ",
"over multiple lines"])