UILabel----根据文字内容准确计算label的高度

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view from its nib.

NSString *test = @"印象人家民俗院占地面积500平方米，有8间客房16张床可同时接待24人住宿、1间厨房操作间、1间餐厅、1间储物间。饭庄选用纯天然食材，特色美食香草饼。 乐在小酒窝主题客栈位于北京市密云县太师屯镇车道峪民俗村内，为村东桥头路南第一家。主旨以“品窖酒、住民俗、享快乐”的精神态度为顾客提供休闲服务，拥有特色小窝9间，，";

//这地方最重要的也是要设置属性字符串 否则计算出来的高度不对

NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:test];

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];

paragraphStyle.lineSpacing = 5;//调整行间距 这个跟计算高度的行间距一定要对应

[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [test length])];

self.testLabel.attributedText = attributedString;

//  [self.testLabel sizeToFit];

CGRect rect =  [self boundsWithFontSize:14 text:test needWidth:300];

self.testLabel.frame = CGRectMake(10, 70, 300, rect.size.height);

}

- (CGRect)boundsWithFontSize:(CGFloat)fontSize text:(NSString *)text needWidth:(CGFloat)needWidth{

NSString *str = text;

if (str.length<=0) {

str= @"";

}

//        str = [str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]; //去除掉首尾的空白字符和换行字符

//        str = [str stringByReplacingOccurrencesOfString:@"\r" withString:@""];

//        str = [str stringByReplacingOccurrencesOfString:@"\n" withString:@""];

//        str = [str stringByReplacingOccurrencesOfString:@" " withString:@""];

//    str = [str stringByReplacingOccurrencesOfString:@"，" withString:@""];

//    str = [str stringByReplacingOccurrencesOfString:@"。" withString:@""];

//    str = [str stringByReplacingOccurrencesOfString:@"、" withString:@""];

NSLog(@"str-----%@",str);

NSMutableAttributedString *attributeString = [[NSMutableAttributedString alloc] initWithString:str];

NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];

style.lineSpacing = 5;

UIFont *font = [UIFont systemFontOfSize:fontSize];

[attributeString addAttribute:NSParagraphStyleAttributeName value:style range:NSMakeRange(0, str.length)];

[attributeString addAttribute:NSFontAttributeName value:font range:NSMakeRange(0, str.length)];

NSStringDrawingOptions options = NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading;

CGRect rect = [attributeString boundingRectWithSize:CGSizeMake(needWidth, CGFLOAT_MAX) options:options context:nil];

NSLog(@"size:%@", NSStringFromCGSize(rect.size));

if ((rect.size.height - font.lineHeight) <= style.lineSpacing) {

if ([[self class] containChinese:str]) {  //如果包含中文

rect = CGRectMake(rect.origin.x, rect.origin.y, rect.size.width, rect.size.height-style.lineSpacing);

}

}

return rect;

}

//判断如果包含中文

+ (BOOL)containChinese:(NSString *)str {

for(int i=0; i< [str length];i++){

int a = [str characterAtIndex:i];

if( a > 0x4e00 && a < 0x9fff){

return YES;

}

}

return NO;

}