如何在Swift连接字符串?
在Objective-C中
NSString *string = @"Swift";
NSString *resultStr = [string stringByAppendingString:@" is a new Programming Language"];
or
NSString *resultStr=[NSString stringWithFormat:@"%@ is a new Programming Language",string];
但我想用swift语言来写。
当前回答
我刚从Objective-C切换到Swift(4)，我发现我经常使用:
let allWords = String(format:"%@ %@ %@",message.body!, message.subject!, message.senderName!)
其他回答
我刚从Objective-C切换到Swift(4)，我发现我经常使用:
let allWords = String(format:"%@ %@ %@",message.body!, message.subject!, message.senderName!)
斯威夫特5
你可以使用附加API来实现它。这将返回一个通过将给定字符串追加到接收器而生成的新字符串。
API详情:此处
Use:
var text = "Hello"
text = text.appending(" Namaste")
结果:
Hello
Hello Namaste
你现在可以在Swift中使用stringByAppendingString。
var string = "Swift"
var resultString = string.stringByAppendingString(" is new Programming Language")
斯威夫特4.2
你也可以使用扩展:
extension Array where Element == String? {
func compactConcate(separator: String) -> String {
return self.compactMap {
if let unwrappedString = $0,
unwrappedString.isEmpty {
return nil
} else {
return $0
}
}
.joined(separator: separator)
}
}
Use:
label.text = [m.firstName, m.lastName].compactConcate(separator: " ")
结果:
"The Man"
"The"
"Man"
var language = "Swift"
var resultStr = "\(language) is a new programming language"
