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
样本
var yourString = "first line \n second line \n third line"
以防您发现+运算符不合适
其他回答
另一种方法是,如果你想使用带有预定义文本的字符串变量,
var textFieldData:String = "John"
myTextField.text = NSString(format: "Hello User, \n %@",textFieldData) as String
myTextField.numberOfLines = 0
下面的例子描述了一个多行连续,使用圆括号作为一个简单的解决方法,以解决Xcode 6.2 Beta版本的Swift错误,它抱怨表达式太复杂,无法在合理的时间内解析,并考虑将其分解为更小的片段:
.
.
.
return String(format:"\n" +
(" part1: %d\n" +
" part2: %d\n" +
" part3: \"%@\"\n" +
" part4: \"%@\"\n" +
" part5: \"%@\"\n" +
" part6: \"%@\"\n") +
(" part7: \"%@\"\n" +
" part8: \"%@\"\n" +
" part9: \"%@\"\n" +
" part10: \"%@\"\n" +
" part12: \"%@\"\n") +
" part13: %f\n" +
" part14: %f\n\n",
part1, part2, part3, part4, part5, part6, part7, part8,
part9, part10, part11, part12, part13, part14)
.
.
.
我尝试了几种方法,但找到了一个更好的解决方案: 只需使用“文本视图”元素。它的文本自动显示多行! 找到这里:UITextField多行
下面是一个简单的实现(Swift 5.4+),使用resultBuilder来清理语法!
@resultBuilder
public struct StringBuilder {
public static func buildBlock(_ components: String...) -> String {
return components.reduce("", +)
}
}
public extension String {
init(@StringBuilder _ builder: () -> String) {
self.init(builder())
}
}
用法:
String {
"Hello "
"world!"
}
// "Hello world!"
Swift 4支持多行字符串字面值。除了换行符,它们还可以包含未转义的引号。
var text = """
This is some text
over multiple lines
"""
旧版本的Swift不允许你在多行上有一个字面值,但你可以在多行上添加字面值:
var text = "This is some text\n"
+ "over multiple lines\n"