UI 03 UIButton 和 UITextField

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可以将UIButton 与 UITextField 结合起来使用, 产生如下图的效果.
最开始运行时的状态
点击button后密码显示

// 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];

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