字符串的方法
- (CGRect)boundingRectWithSize:(CGSize)size options:(NSStringDrawingOptions)options attributes:(NSDictionary *)attributes context:(NSStringDrawingContext *)contextNS_AVAILABLE_IOS(7_0);
例如:
CGSize size = CGSizeMake(20000,TITLE_LABLE_Height);
NSDictionary * attributeDic = [NSDictionary dictionaryWithObjectsAndKeys:[UIFont systemFontOfSize:14.0],NSFontAttributeName, nil];
CGRect text = [string boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin attributes:attributeDic context:nil];