iOS之動態計算文字的高度，ios計算高度

iOS之動態計算文字的高度，ios計算高度

+ (CGSize)boundingALLRectWithSize:(NSString *)txt Font:(UIFont *)font Size:(CGSize)size {        NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:txt];    NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];    [style setLineSpacing:2.0f];//切記LineSapcing >= 2,不然會顯示不全    [attributedString addAttribute:NSParagraphStyleAttributeName value:style range:NSMakeRange(0, [txt length])];        CGSize realSize = CGSizeZero;#if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_6_1    CGRect textRect = [txt boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:font, NSParagraphStyleAttributeName:style} context:nil];    realSize = textRect.size;#else    realSize = [txt sizeWithFont:font constrainedToSize:size];#endif        realSize.width = ceilf(realSize.width);    realSize.height = ceilf(realSize.height);    return realSize;}

調用：float strHeight = [Util boundingALLRectWithSize:str Font:[UIFont systemFontOfSize:14] Size:CGSizeMake(SCREEN_WIDTH-24, MAXFLOAT)].height;