获取文字高度以及根据label内容来调整label的高度

ios7以上已经摒弃 sizeWithFont 这个方法，需要用到 boundingRectWithSize 来获取文字的高度

 

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UIFont *font = [UIFont fontWithName:@"Arial" size:14];//跟label的字体大小一样    CGSize size = CGSizeMake(300, 29999);//跟label的宽设置一样    if (is_IOS_7)    {        NSDictionary * dic = [NSDictionary dictionaryWithObjectsAndKeys:font, NSFontAttributeName,nil];                 size =[text boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin |NSStringDrawingUsesFontLeading attributes:dic context:nil].size;    }    else    {        size = [text sizeWithFont:font constrainedToSize:size lineBreakMode:NSLineBreakByCharWrapping];//ios7以上已经摒弃的这个方法    }

 

UILabel根据内容自动调整高度 

sizeWithFont已经被Apple抛弃了，但还是可以用的

 

1 2	CGSize size = [news_str sizeWithFont:label.font constrainedToSize:CGSizeMake(label.frame.size.width, MAXFLOAT) lineBreakMode:NSLineBreakByWordWrapping];     label.frame = CGRectMake(label.frame.origin.x, label.frame.origin.y, size.width, size.height);

 

iOS7出来以后，以前的UILabel根据内容获得高度和宽度不建议用了，虽然还可以用，但是总有有强迫症的，不希望有警告，这段代码是iOS7以后UILabel可以根据内容改变高度和宽度。

 

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NSString *str = @"866.44"; UIFont *font = [UIFont systemFontOfSize:13]; CGSize size = CGSizeMake(320,2000); CGRect labelRect = [str boundingRectWithSize:size options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading) attributes:[NSDictionary dictionaryWithObject:font forKey:NSFontAttributeName] context:nil]; UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, labelRect.size.width, labelRect.size.height)]; label.text = str; label.font = [UIFont systemFontOfSize:13]; [self.view addSubview: label];

 

/*根据label内容来调整label的高度*/
- (void)resizeLabelByContent:(UILabel *)label
{
    CGSize maxSize = CGSizeMake(label.width, 999);
    label.numberOfLines = 0;
    NSString *contentStr = label.text;
    UIFont *contentFont = label.font;

    CGRect contentFrame;

    NSString *version = [[UIDevice currentDevice] systemVersion];
    if ([version floatValue] < 7.0) {
        CGSize contentStringSize = [contentStr sizeWithFont:contentFont                 constrainedToSize:maxSize lineBreakMode:label.lineBreakMode];
        contentFrame = CGRectMake(label.left, label.top, label.width,               contentStringSize.height);
    } else {
        NSDictionary *contentDic = [NSDictionary                dictionaryWithObjectsAndKeys:contentFont, NSFontAttributeName, nil];
        CGSize contentStrSize = [contentStr boundingRectWithSize:maxSize                options:NSStringDrawingUsesLineFragmentOrigin attributes:contentDic                 context:nil].size;
        contentFrame = CGRectMake(label.left, label.top, label.width,           contentStrSize.height);
    }
    label.frame = contentFrame;
}