Created
October 23, 2012 20:12
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textField: shouldChangeCharactersInRange: for decimal keyboard
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-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string | |
{ | |
if (textField == self.amountInput) { | |
if (string.length == 0) { | |
return YES; // backspace | |
} | |
NSNumberFormatter* numberFormatter = [[NSNumberFormatter alloc] init]; | |
[numberFormatter setFormatterBehavior: NSNumberFormatterBehavior10_4]; | |
[numberFormatter setNumberStyle: NSNumberFormatterDecimalStyle]; | |
NSString* decimalSeparator = [[[numberFormatter stringFromNumber:@0.1] substringFromIndex:1] substringToIndex:1]; | |
NSString* allowedCharacters = [decimalSeparator stringByAppendingString:@"0123456789"]; | |
unichar decimalSeparatorChar = [decimalSeparator characterAtIndex:0]; | |
NSCharacterSet *myCharSet = [NSCharacterSet characterSetWithCharactersInString:allowedCharacters]; | |
for (int i = 0; i < [string length]; i++) { | |
unichar c = [string characterAtIndex:i]; | |
if (textField.text.length == 0 || [textField.text containsString:decimalSeparator]) { | |
if (c == decimalSeparatorChar) { | |
return NO; | |
} | |
} | |
if (textField.text.length > 0) { | |
NSString* zeros = [@"" stringByPaddingToLength:textField.text.length withString: @"0" startingAtIndex:0]; | |
if (c == '0' && [textField.text isEqualToString:zeros]) { | |
return NO; | |
} | |
} | |
if ([myCharSet characterIsMember:c]) { | |
return YES; | |
} | |
} | |
return NO; | |
} | |
return YES; | |
} |
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