如何使用NSAttributedString強調字符串的一部分objective-c

Question

只有在範圍從零開始時，字符串的下劃線才起作用。如果我從1開始，那麼它的工作原理。綠色的顏色無論如何工作。

+ (NSAttributedString*)returnNSAttributedString:(NSString*)string range:(NSRange)range WithColour:(UIColor*)colour WithUnderLine:(BOOL)underline { 
    NSMutableAttributedString *attributedString = 
    [[NSMutableAttributedString alloc] initWithString:string]; 
    if (underline) { 
     [attributedString addAttributes:@{NSUnderlineStyleAttributeName: @(NSUnderlineStyleSingle)} range:range]; 
    } 
    [attributedString addAttribute:NSForegroundColorAttributeName value:colour range:range]; 
    [attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSRangeFromString(string)]; 
    return attributedString; 
} 

它適用於iOS 7的iOS不8.

Answer 1

您可以使用NSUnderlineStyleAttributeName和NSUnderlineColorAttributeName屬性。您可以使用它像這樣：

NSRange foundRange = [wordString rangeOfString:@"Base Mix"]; 
if (foundRange.location != NSNotFound) 
{ 
    [wordString beginEditing]; 
    [wordString addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInt:1] range:foundRange]; 
    [wordString addAttribute:NSUnderlineColorAttributeName value:[NSColor redColor] range:foundRange]; 
    [wordString endEditing]; 
} 

Answer 2

斯威夫特：

一個小方法。獲取一個字符串並在整個字符串長度上返回一個帶有下劃線屬性的NSMutableAttributedString。

func getUnderlinedAttributedString(string string: String) -> NSMutableAttributedString 
{ 
    let attributedString = NSMutableAttributedString.init(string: string) 
    let stringRange = NSMakeRange(0, attributedString.length) 

    attributedString.beginEditing() 
    attributedString.addAttribute(NSUnderlineStyleAttributeName, value: 1, range: stringRange) 
    attributedString.endEditing() 

    return attributedString 
}