UI 03 UIButton 和 UITextField

可以将UIButton 与 UITextField 结合起来使用, 产生如下图的效果.

// 新建一个Button
    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
    button.frame = CGRectMake(100, 300, 50, 50);
    button.backgroundColor = [UIColor cyanColor];
    [self.window addSubview:button];

    button.layer.borderWidth = 1;
    [button setTitle:@"显示" forState:UIControlStateNormal ];
    [button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];

    // 新建一个UITextField的属性.
    self.textField = [[UITextField alloc] initWithFrame:CGRectMake(70, 100, 120, 50)];
    self.textField.backgroundColor = [UIColor whiteColor];
    [self.window addSubview:self.textField];
    [self.textField release];

    self.textField.textColor = [UIColor cyanColor];
    self.textField.layer.borderWidth = 1;
    self.textField.layer.cornerRadius = 10;
    self.textField.clearButtonMode = UITextFieldViewModeAlways;
    self.textField.placeholder = @"请输入密码";
    self.textField.secureTextEntry = YES;
    self.textField.keyboardType = UIKeyboardTypeNumberPad;
    self.textField.tag = 1000;

    // 他是UIControl的子类,可以添加addTag 方法
    [self.textField addTarget:self action:@selector(chageValue:) forControlEvents:UIControlEventEditingChanged];

    //创建一个按钮,用来切换状态
    UIButton *newButton = [UIButton buttonWithType:UIButtonTypeCustom];
    newButton.frame = CGRectMake(60, 180, 40, 40);
    newButton.backgroundColor = [UIColor whiteColor];
    [self.window addSubview:newButton];
    self.isSelect = NO;
    [newButton setImage:[UIImage imageNamed:@"check.png"] forState:UIControlStateNormal];
    [newButton addTarget:self action:@selector(changePic:) forControlEvents:UIControlEventTouchUpInside];

    // 创建一个label来显示
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(110, 180, 150, 40)];
    label.backgroundColor = [UIColor whiteColor];
    [self.window addSubview:label];
    [label release];

    label.text = @"是否显示密码";
    label.alpha = 0.5;

 //创建一个label
    self.label = [[UILabel alloc] initWithFrame:CGRectMake(210, 110, 150, 30)];
    self.label.backgroundColor = [UIColor whiteColor];
    [self.window addSubview:self.label];
    [_label release];
    self.label.alpha = 0.5;
    self.label.text = @"passWord lenth";

对应的方法:

- (void)click:(UIButton *)button{
//    UITextField *t = (UITextField *)[self.window viewWithTag:1000];
    NSLog(@"%@",self.textField.text);

}

- (void)changePic:(UIButton *)button{
    if (self.isSelect) {
        [button setImage:[UIImage imageNamed:@"check.png"] forState:UIControlStateNormal];
    }else{
         [button setImage:[UIImage imageNamed:@"checked.png"] forState:UIControlStateNormal];
    }
    self.isSelect = !self.isSelect;
    self.textField.secureTextEntry = !self.textField.secureTextEntry;
}


- (void)chageValue:(UITextField *)textField{
    NSLog(@"%@",textField.text);
    if (textField.text.length >5) {
        self.label.text = @"密码长度适合";
    }else{
        self.label.text = @"密码长度太短";
    }

}

从图中还可以看到一个mybutton 字样的button.
那个是新建的继承于UIButton的MyButton 类.

  // MyButton类型的对象.
    MyButton *meButton = [MyButton buttonWithType:UIButtonTypeSystem];
    meButton.frame = CGRectMake(200, 250, 100, 100);
    meButton.buttonName = @"宋某人";
    [self.window addSubview:meButton];
    [meButton setTitle:@"myButton" forState:UIControlStateNormal];