UITextField手動編寫

1、UITextField手動編寫控件

    UITextField  *txtAccount = [[UITextField alloc] initWithFrame:CGRectMake(10, 10,300, 30)];

    // 設置委託

    [txtAccount setDelegate:self];

    // 設置佔位符

    [txtAccount setPlaceholder:@"帳號"];

    // 設置顏色

    [txtAccount setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];

    // 設置字體

    [txtAccount setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@"_placeholderLabel.font"];

    // 設置文本對齊

    [txtAccount setTextAlignment:NSTextAlignmentLeft];

    // 設置樣式

    [txtAccount setBorderStyle:UITextBorderStyleRoundedRect];

    // 加入view中

    [self.view addSubview: txtAccount];

    [txtAccount release];

2、UITextFieldDelegate委託

// 設置輸入框，是否能夠被修改

// NO-將沒法修改，不出現鍵盤

// YES-能夠修改，默認值 

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{

    return YES;

}

// 當點擊鍵盤的返回鍵（右下角）時，執行該方法。

// 通常用來隱藏鍵盤

- (BOOL)textFieldShouldReturn:(UITextField *)textField{

    if (txtAccount == textField) {

[txtAccount resignFirstResponder];

}

return YES;

}

// 當輸入框得到焦點時，執行該方法。 

- (void)textFieldDidBeginEditing:(UITextField *)textField{

    NSLog(@"textFieldDidBeginEditing");

}

// 指定是否容許文本字段結束編輯，容許的話，文本字段會失去first responder 

- (BOOL)textFieldShouldEndEditing:(UITextField *)textField{

    return YES;

}

// 文本框失去first responder 時，執行  

- (void)textFieldDidEndEditing:(UITextField *)textField{

     NSLog(@"textFieldDidEndEditing");

}

// 指明是否容許根據用戶請求清除內容

- (BOOL)textFieldShouldClear:(UITextField *)textField{

    NSLog(@"textFieldDidEndEditing");

    return YES;

}

// 文本框的文本，是否能被修改 

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

    return YES;

}