UITextFiled限制输入字母并且输入的字母大写

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代码：

- (void)viewDidLoad {    [super viewDidLoad];    //    NSArray *myArr = [NSArray arrayWithObjects:@"1.jpg",@"2.jpg",@"3.jpg",@"4.jpg",@"5.jpg",@"6.jpg",@"7.jpg", nil];////    NSUInteger count = [myArr count];//    for (int index = 0 ; index<count; index++) {//        [self layoutSubImage:myArr[index] withX:50*(index%3) withY:50*(index/3)];//    }        _aField.delegate = self;    [_aField addTarget:self action:@selector(textFieldChanged:) forControlEvents:UIControlEventEditingChanged];}

- (void)textFieldChanged:(UITextField *)aTextField{    aTextField.text = [aTextField.text uppercaseString];}- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{    NSCharacterSet *set = [[NSCharacterSet characterSetWithCharactersInString:ALLCHARACTERS] invertedSet];    NSString *upperStr = [string uppercaseString];    NSString *filted = [[upperStr componentsSeparatedByCharactersInSet:set] componentsJoinedByString:@""];    NSLog(@"string>>>%@,fileted>>>%@",string,filted);    BOOL allowed = [upperStr isEqualToString:filted];    return allowed;}

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