1.计算字符串高度

iOS6中的方法:

CGSize  sizeTofit =  [str sizeWithFont:[UIFont                           fontWithName:MPFONTNAME size:16] forWidth: 100  lineBreakMode:NSLineBreakByWordWrapping];

iOS7中方法:

CGRect tmpRect = [str boundingRectWithSize:CGSizeMake(100,MAXFLOAT)options:NSStringDrawingUsesLineFragmentOriginattributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIFont fontWithName:MPFONTNAME size:16],NSFontAttributeName,nil]context:nil];

headerHeight= tmpRect.size.height;

2.字符串中是否含有中文

+ (BOOL)checkIsChinese:(NSString *)string

{

      for(int  i=0; i<string.length; i++){

                unichar ch = [string characterAtIndex:i];

                 if(0x4E00<= ch  && ch <=0x9FA5)

                 {

                           return  YES;

                   }

          }

          return  NO;

}

3.去除空格和回车

(1)去除两端空格

NSString *temp = [textField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];

(2)去除两端空格和回车

NSString *text = [temp stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet ]];

4.获取汉字的拼音

- (NSString*)transform:(NSString*)chinese

{

//将NSString装换成NSMutableString

NSMutableString*pinyin = [chinese mutableCopy];

//将汉字转换为拼音(带音标)

CFStringTransform((__bridge CFMutableStringRef)pinyin,NULL,kCFStringTransformMandarinLatin,NO);

NSLog(@"%@", pinyin);

//去掉拼音的音标

CFStringTransform((__bridge CFMutableStringRef)pinyin,NULL,kCFStringTransformStripCombiningMarks,NO);

NSLog(@"------%@--------", pinyin);

//返回最近结果

return pinyin;

}

5.将字符串title复制到剪贴板

UIPasteboard*pasteboard = [UIPasteboard  generalPasteboard];

pasteboard.string= title;