ios - Determine how many characters there are after a certain character in UITextField

Question

I am working with a UITextField and numerical input. I need to determine how many characters there are AFTER a specific character(.). Is this possible with NSString methods at all, if so How? I have tried using the shouldReplaceCharacters: method without much success.

Thanks, Virindh Borra

Answer 1

NSUInteger *position = [givenString rangeOfString:@"."].location;
NSUInteger result = givenString.length - position - 1;

或替代方案：

NSArray *splittedString = [givenString componentsSeparatedByString:@"."];
NSUInteger count = [splittedString count];
if (count > 1) {
     NSString *stringAfterDot = (NSString*)[splittedString objectAtIndex:1];
     NSUInteger result = stringAfterDot.length;
     (...)
}

第一个将返回第一个点之后的字符数，第二个将返回第一个和第二个点之间的字符数（或字符串的结尾，如果没有第二个点）。