如何检查NSString是否包含'％'？

Question

我想问一个关于目标的问题C. NSString *是否包含一些函数来检查NSString *在UITextField.text中是否包含一些字符串？例如

NSString *checkString = @"abcd%"

if(checkString contains '%') // I want this function
   return YES;
else
   return NO;

Answer 1

if([checkString rangeOfString:@"%"].location != NSNotFound)
    // hooray!

Answer 2

您可以使用- (NSRange)rangeOfString:(NSString *)aString。代码看起来像：

NSRange range = [UITextField.text rangeOfString:@"!"];

if (range.length > 0){
  NSLog(@"String contains '!'");
}
else {
  NSLog(@"No '!' found in string");
}

Answer 3

上一篇文章中的代码不正确

NSRange range = [UITextField.text rangeOfString:@"!"];

if (range.length >= 0){
  NSLog(@"String contains '!'");
}
else {
  NSLog(@"No '!' found in string");
}

应该是“range.length＆gt; 0”