在标签中发出获取字符串的行数组

Question

我有一个字符串：“制作牙膏和漱口水的想法”。

我使用波纹管代码来获取 label 上的最后一个字符串。结果字符串最后一行：“和漱口水”。但是标签显示的最后一行：“牙膏和漱口水”如何在标签上准确获取最后一行的字符串？这是我的代码：

-(NSArray *)getLinesArrayOfStringInLabel:(UILabel *)label 
{ 
    NSString *text = [label text]; 
    UIFont *font = [label font]; 
    CGRect rect = [label bounds]; 
    CTFontRef myFont = CTFontCreateWithName((__bridge CFStringRef)([font fontName]), [font pointSize], NULL); 
    NSMutableAttributedString *attStr = [[NSMutableAttributedString alloc] initWithString:text]; 
    [attStr addAttribute:(NSString *)kCTFontAttributeName value:(__bridge id)myFont range:NSMakeRange(0, attStr.length)]; 
    CTFramesetterRef frameSetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)attStr); 
    CGMutablePathRef path = CGPathCreateMutable(); 
    CGPathAddRect(path, NULL, CGRectMake(0,0,rect.size.width,100000)); 
    CTFrameRef frame = CTFramesetterCreateFrame(frameSetter, CFRangeMake(0, 0), path, NULL); 
    NSArray *lines = (__bridge NSArray *)CTFrameGetLines(frame); 
    NSMutableArray *linesArray = [[NSMutableArray alloc]init]; 
    for (id line in lines) 
    { 
        CTLineRef lineRef = (__bridge CTLineRef )line; 
        CFRange lineRange = CTLineGetStringRange(lineRef); 
        NSRange range = NSMakeRange(lineRange.location, lineRange.length); 
        NSString *lineString = [text substringWithRange:range]; 
        [linesArray addObject:lineString]; 
    } 
    return (NSArray *)linesArray;
}

Answer 1

您可以使用 NSRange 来获取您的字符串，下面的代码可以帮助您：-

NSString *strSource=@"The idea of making a toothpaste and a mouthwashg";
NSRange r1 = [strSource rangeOfString:@"toothpaste"];
NSRange r2 = [strSource rangeOfString:@"mouthwashg"];
NSRange rSub = NSMakeRange(r1.location , r2.location + r2.length - r1.location );
NSLog(@"your string:%@",[strSource substringWithRange:rSub]);