contextField 键盘只允许输入数字和小数点，并且现在小数点后位数

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{

if (textField == self.monthSalaryCellView.contentTextField){

NSSet *numberSet = [NSSet setWithObjects:@"0",@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@".",@"", nil];

if (![numberSet containsObject:string]) { // 只能输入数字和点

return NO;

}

if ([textField.text rangeOfString:@"."].length && [string isEqualToString:@"."]) {  // 最多只能输入一个点

return NO;

}

// 最多输入两位小数

NSArray *parts = [textField.text componentsSeparatedByString:@"."];

if (parts.count == 2) {

if ([parts[1] length] == 2 && ![string isEqualToString:@""] && range.location > textField.text.length - 3) {

return NO;

}

}

}

return YES;

}