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I want to ask a question about the objective C. Does the NSString * contains some functions to check the NSString * contains some string in the UITextField.text? For example
NSString *checkString = @"abcd%"
if(checkString contains '%') // I want this function
return YES;
else
return NO;
493
You can check if [string length] == 0 . This will check if it's a valid but empty string (@"") as well as if it's nil, since calling length on nil will also return 0. There are some very rare NSStrings where this will result in a false negative (saying the string isn't empty, when, for practical purposes, it is).
The Swift string is one character long, as expected. The NSString says it has a length of seven — this matches with the length of the Swift string's utf16 view, since NSStrings are backed by UTF-16: 09:02 The Swift string's unicodeScalars view returns a count of four.
if([checkString rangeOfString:@"%"].location != NSNotFound)
// hooray!
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