根据Label的文字内容动态计算Label高度

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#define kSCREEN_WIDTH 320

#define kMARGIN 20

UILabel *detailLabel = [[UILabelalloc]initWithFrame:CGRectZero];

[selfaddSubview:detailLabel];

[detailLabel release];

[detailLabel setFont:[UIFont systemFontOfSize:12]];

[detailLabel setNumberOfLines:0];

[detailLabel setLineBreakMode:NSLineBreakByWordWrapping];

[detailLabel setFrame:CGRectMake(kMARGIN,kMARGIN,kSCREEN_WIDTH -kMARGIN *2, [self LabelHeight:string labelFontSize:12])];

//string传进的字符串，fontSize字体大小

- (CGFloat)LabelHeight:(NSString *)string labelFontSize:(CGFloat)fontSize

{

CGSize constraint = CGSizeMake(kSCREEN_WIDTH -kMARGIN * 2, 50000.0f);

//此处字体要与Label的字体一致

NSDictionary *attributes = [NSDictionary dictionaryWithObject:[UIFont systemFontOfSize:fontSize]forKey:NSFontAttributeName];

NSAttributedString *attributedText = [[[NSAttributedString alloc] initWithString:string

attributes:attributes] autorelease];

CGRect rect = [attributedText

boundingRectWithSize:constraint

options:NSStringDrawingUsesLineFragmentOrigin

context:nil];

CGSize size = rect.size;

CGFloat height = MAX(size.height, 0.0f);

return height;

}

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