IOS 去空格处理 特殊字符处理

1. 去掉字符串中两边的空格

 NSCharacterSet *whiteSpace = [NSCharacterSetwhitespaceAndNewlineCharacterSet];

    NSString *strr = [[NSStringalloc]initWithString:[self.userTF.textstringByTrimmingCharactersInSet:whiteSpace]];

2. 去掉字符串中所有的空格

 NSString *strUrl = [[self.dicobjectForKey:@"mailbody_text"]stringByReplacingOccurrencesOfString:@" "withString:@""];

3. 特殊字符处理

 NSString *subString = (__bridge NSString *) CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,            CFStringRef)self.subTextField.text,NULL,CFSTR(":/?#[]@!$&’()*+,;="),                                                 kCFStringEncodingUTF8);