UIlabel点击全文扩展

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传入初始化frame之后的lab，返回的是每行的string。

通过计算最后一行string的rect得到全文/扩展btn的x,y值

-(NSArray*)getSeparatedLinesFromLabel:(UILabel *)label

{

NSString *text= [label text];

UIFont *font = [label font];

CGRect rect = [labelframe];

CTFontRefmyFont = CTFontCreateWithName((__bridge CFStringRef)([font fontName]), [fontpointSize], NULL);

NSMutableAttributedString*attStr = [[NSMutableAttributedString alloc] initWithString:text];

[attStraddAttribute:(NSString *)kCTFontAttributeName value:(__bridge id)myFont range:NSMakeRange(0,attStr.length)];

CTFramesetterRefframeSetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)attStr);

CGMutablePathRefpath = CGPathCreateMutable();

CGPathAddRect(path,NULL, CGRectMake(0,0,rect.size.width,100000));

CTFrameRefframe = CTFramesetterCreateFrame(frameSetter, CFRangeMake(0, 0), path, NULL);

NSArray *lines= (__bridge NSArray *)CTFrameGetLines(frame);

NSMutableArray*linesArray = [[NSMutableArray alloc]init];

for (id line inlines)

{

CTLineReflineRef = (__bridge CTLineRef )line;

CFRangelineRange = CTLineGetStringRange(lineRef);

NSRange range =NSMakeRange(lineRange.location, lineRange.length);

NSString*lineString = [text substringWithRange:range];

[linesArrayaddObject:lineString];

}

return (NSArray*)linesArray;

}

如下所示

btn紧随最后一行文字的后面

NSArray * arr = [selfgetSeparatedLinesFromLabel:_lab];

CGRect rect =[[arr lastObject] boundingRectWithSize:CGSizeMake(SREENWIDTH, MAXFLOAT)options:NSStringDrawingUsesFontLeading | NSStringDrawingUsesLineFragmentOriginattributes:@{NSFontAttributeName:[UIFont systemFontOfSize:15]} context:nil];

UIButton * btn= [UIButton buttonWithType:UIButtonTypeCustom];

btn.frame = CGRectMake(rect.size.width+10,(arr.count-1)*(rect.size.height), 50, rect.size.height);

[btn setTitle:@"全文" forState:UIControlStateNormal];

[btnsetTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

[btn addTarget:selfaction:@selector(method) forControlEvents:UIControlEventTouchUpInside];

_lab.frame = CGRectMake(0,60, SREENWIDTH, CGRectGetMaxY(btn.frame));

_lab.userInteractionEnabled = YES;

[self.viewaddSubview:_lab];

[_labaddSubview:btn];

截取的文字长度，替换的文字自行处理

点击全文把之前的text重新赋值给lab ,重新计算frame即可

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