label适应文字

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//第一种：显示全部

UIFont *font = [UIFontfontWithName:@"Arial"size:17];

CGSize size = CGSizeMake(320,2000);

CGSize labelsize = [strsizeWithFont:font constrainedToSize:sizelineBreakMode:UILineBreakModeWordWrap];

label.frame = CGRectMake(view.frame.origin.x + view.frame.size.width + 10, view.frame.origin.y, labelsize.width, labelsize.height);

// 第二种：只能显示一部分

NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:label.font, @"NSFontAttributeName", nil];

CGRect frame = [str boundingRectWithSize:CGSizeMake(1000, 1000) options:NSStringDrawingUsesLineFragmentOrigin attributes:dic context:nil];

frame.origin.x = view.frame.origin.x + view.frame.size.width + 10;

frame.origin.y = view.frame.origin.y;

label.frame = frame;

//第三种：比第二种显示得更少一些

NSAttributedString *attrStr = [[NSAttributedStringalloc] initWithString:label.text];

label.attributedText = attrStr;

NSRange range = NSMakeRange(0, attrStr.length);

//获取该段attributedString的属性字典

NSDictionary *dic = [attrStrattributesAtIndex:0effectiveRange:&range];

//计算文本的大小

CGSize textSize = [label.textboundingRectWithSize:label.bounds.sizeoptions:NSStringDrawingUsesLineFragmentOriginattributes:dic context:nil].size;

label.frame = CGRectMake(view.frame.origin.x + view.frame.size.width + 10, view.frame.origin.y, textSize.width, textSize.height);

//第四种：算高

NSDictionary *dic = @{NSFontAttributeName:[UIFontsystemFontOfSize:17]};

CGRect rect = [self.evalDetail.descp boundingRectWithSize:CGSizeMake(WIDTH -20, 10000) options:NSStringDrawingUsesLineFragmentOrigin attributes:dic context:nil];

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