[IOS 开发] NSString-计算文本的宽度和高度

UIFont *theFont  = [UIFont systemFontOfSize:14];

NSString *strText = @"这是一段很长的字符串，我们将根据要求的字体大小，来计算实际需要的宽度和高度！";

NSMutableDictionary *dic = [NSMutableDictionary dictionaryWithObject:[UIFont systemFontOfSize:14] forKey:NSFontAttributeName];
CGSize size = [strText boundingRectWithSize:CGSizeMake(MAXFLOAT, 0.0) options:NSStringDrawingUsesLineFragmentOrigin attributes:dic context:nil].size;

  

NSMutableDictionary *dic = [NSMutableDictionary dictionaryWithObject:[UIFont systemFontOfSize:14] forKey:NSFontAttributeName];
CGSize size = [strText boundingRectWithSize:CGSizeMake(100.0, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:dic context:nil].size;

 

typedef NS_ENUM(NSInteger, NSLineBreakMode) {

   NSLineBreakByWordWrapping =0,   

   NSLineBreakByCharWrapping,

   NSLineBreakByClipping,

   NSLineBreakByTruncatingHead,

   NSLineBreakByTruncatingTail,

   NSLineBreakByTruncatingMiddle

}NS_ENUM_AVAILABLE_IOS(6_0);