UITextField手动编写

1、UITextField手动编写控件

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

    // 设置委托

    [txtAccount setDelegate:self];

    // 设置占位符

    [txtAccount setPlaceholder:@"帐号"];

    // 设置颜色

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

    // 设置字体

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

    // 设置文本对齐

    [txtAccount setTextAlignment:NSTextAlignmentLeft];

    // 设置样式

    [txtAccount setBorderStyle:UITextBorderStyleRoundedRect];

    // 加入view中

    [self.view addSubview: txtAccount];

    [txtAccount release];

2、UITextFieldDelegate委托

// 设置输入框，是否能够被修改

// NO-将没法修改，不出现键盘

// YES-能够修改，默认值 

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

    return YES;

}

// 当点击键盘的返回键（右下角）时，执行该方法。

// 通常用来隐藏键盘

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

    if (txtAccount == textField) {

[txtAccount resignFirstResponder];

}

return YES;

}

// 当输入框得到焦点时，执行该方法。 

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

    NSLog(@"textFieldDidBeginEditing");

}

// 指定是否容许文本字段结束编辑，容许的话，文本字段会失去first responder 

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

    return YES;

}

// 文本框失去first responder 时，执行  

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

     NSLog(@"textFieldDidEndEditing");

}

// 指明是否容许根据用户请求清除内容

- (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;

}