Iphone 替换UITextView中的文本

我正在尝试编写一个小概念应用程序，当用户在UITextView中键入字符流时，它会读取字符流，当输入某个单词时，它会被替换（有点像自动更正）

我研究了使用-

(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text;

但到目前为止，我没有运气。谁能给我一个提示吗

非常感谢

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大卫：这是正确的方法。其对象是否设置为UITextView的委托

更新：
-修正了上面的“UITextView”（我以前有“UITextField”）
-下面添加了代码示例：

此方法实现位于UITextView的委托对象中（例如，其视图控制器或应用程序委托）：

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您是调用txtView:shouldChangeTextInRange:replacementText:？一切都连接好了，我只是不知道如何使用此方法将给定字符串替换为另一个字符串。谢谢

// replace "hi" with "hello"
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {

    // create final version of textView after the current text has been inserted
    NSMutableString *updatedText = [[NSMutableString alloc] initWithString:textView.text];
    [updatedText insertString:text atIndex:range.location];

    NSRange replaceRange = range, endRange = range;

    if (text.length > 1) {
        // handle paste
        replaceRange.length = text.length;
    } else {
        // handle normal typing
        replaceRange.length = 2;  // length of "hi" is two characters
        replaceRange.location -= 1; // look back one characters (length of "hi" minus one)
    }

    // replace "hi" with "hello" for the inserted range
    int replaceCount = [updatedText replaceOccurrencesOfString:@"hi" withString:@"hello" options:NSCaseInsensitiveSearch range:replaceRange];

    if (replaceCount > 0) {
        // update the textView's text
        textView.text = updatedText;

        // leave cursor at end of inserted text
        endRange.location += text.length + replaceCount * 3; // length diff of "hello" and "hi" is 3 characters
        textView.selectedRange = endRange; 

        [updatedText release];

        // let the textView know that it should ingore the inserted text
        return NO;
    }

    [updatedText release];

    // let the textView know that it should handle the inserted text
    return YES;
}