iOS sizeWithFont 过期 is deprecated

原文： http://www.cnblogs.com/A--G/p/4819189.html

iOS 2.0之后 sizeWithFont就被弃用了：

1 //计算textview 高度
2 - (float) heightForTextView: (UITextView *)textView WithText: (NSString *) strText{
3     
4 //    float fPadding = 16.0; // 8.0px x 2
5 //    CGSize constraint = CGSizeMake(textView.contentSize.width - fPadding, CGFLOAT_MAX);
6 //    
7 //    CGSize size = [strText sizeWithFont: textView.font constrainedToSize:constraint lineBreakMode:NSLineBreakByWordWrapping];
8     
9 //    float fHeight = size.height + 16.0;

　　　可以采用boundingRectWithSize，这里举个栗子~

 1     NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];
 2     paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;
 3     NSDictionary *attributes = @{NSFontAttributeName:textView.font, NSParagraphStyleAttributeName:paragraphStyle.copy};
 4     
 5     float fPadding = 16.0; // 8.0px x 2
 6     CGSize constraint = CGSizeMake(textView.contentSize.width - fPadding, CGFLOAT_MAX);
 7 
 8     CGSize size = [strText boundingRectWithSize:constraint options:NSStringDrawingUsesLineFragmentOrigin attributes:attributes context:nil].size;
 9 
10     float fHeight = size.height + 16.0;
11     
12     return fHeight;