Swift字符串过滤空格和换行符,写法与原来的objective-c有点不同,因为Swift中的字符串的索引不是int类型,而是Index类型。
@H_403_5@/// UIView's useful extensions.
@H_403_5@///
@H_403_5@/// Author: huangyibiao
@H_403_5@/// Github: http://github.com/CoderJackyHuang/
@H_403_5@/// Blog: http://www.hybblog.com/
extension String {
@H_403_5@/// Get the length of a string
public func hyb_length() ->Int {
return self.characters.count
}
@H_403_5@/// 去掉字符串前后的空格,根据参数确定是否过滤换行符
@H_403_5@///
@H_403_5@/// - parameter trimNewline 是否过滤换行符,默认为false
public func hyb_trim(trimNewline: Bool = false) ->String {
if trimNewline {
return self.stringByTrimmingCharactersInSet(.whitespaceAndNewlineCharacterSet())
}
return self.stringByTrimmingCharactersInSet(.whitespaceCharacterSet())
}
@H_403_5@/// 去掉字符串前面的空格,根据参数确定是否过滤换行符
@H_403_5@///
@H_403_5@/// - parameter trimNewline 是否过滤换行符,默认为false
public func hyb_trimLeft(trimNewline: Bool = false) ->String {
if self.isEmpty {
return self
}
var index = self.startIndex
while index != self.endIndex {
let ch = self.characters[index]
if ch == Character(" ") {
index++
continue
} else if ch == Character("\n") {
if trimNewline {
index++
continue
} else {
break
}
}
break
}
return self.substringFromIndex(index)
}
@H_403_5@/// 去掉字符串后面的空格,根据参数确定是否过滤换行符
@H_403_5@///
@H_403_5@/// - parameter trimNewline 是否过滤换行符,默认为false
public func hyb_trimRight(trimNewline: Bool = false) ->String {
if self.isEmpty {
return self
}
var index = self.endIndex.predecessor()
while index != self.startIndex {
let ch = self.characters[index]
if ch == Character(" ") {
index--
continue
} else if ch == Character("\n") {
if trimNewline {
index--
continue
} else {
index++
break
}
}
break
}
return self.substringToIndex(index)
}
}