Iphone代码创建视图

要想以编程的方式创建视图，需要使用视图控制器中定义的viewDidLoad方法，只有在运行期间生成UI时才需要实现该方法。

在此只贴出viewDidLoad方法的代码，因为只需要在这个方法里面编写代码：

- (void)viewDidLoad
{
    self.navigationItem.title = @"动态创建UI";
    UIView *myview = [[UIView alloc]initWithFrame:[UIScreen mainScreen].applicationFrame];
    myview.backgroundColor = [UIColor blackColor];

    CGRect frame = CGRectMake(10, 15, 300, 20);
    UILabel *mylabel = [[UILabel alloc]initWithFrame:frame];
    mylabel.text = @"这是动态创建的label";
    mylabel.backgroundColor = [UIColor clearColor];
    mylabel.font = [UIFont fontWithName:@"Verdana" size:20];
    mylabel.textColor = [UIColor lightGrayColor];
    mylabel.textAlignment = UITextAlignmentCenter;

    frame = CGRectMake(10, 70, 300, 50);
    //UIButton *mybutton = [[UIButton alloc]initWithFrame:frame];
    UIButton *mybutton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    mybutton.frame = frame;
    [mybutton setTitle:@"点我" forState:UIControlStateNormal];
    mybutton.backgroundColor = [UIColor clearColor];
    [mybutton addTarget:self action:@selector(buttonclc) forControlEvents:UIControlEventTouchUpInside];
    [myview addSubview:mylabel];
    [myview addSubview:mybutton];
    self.view = myview;
    [mylabel release];
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
}

- (void)viewDidLoad
{
    self.navigationItem.title = @"动态创建UI";
    UIView *myview = [[UIView alloc]initWithFrame:[UIScreen mainScreen].applicationFrame];
    myview.backgroundColor = [UIColor blackColor];
    
    CGRect frame = CGRectMake(10, 15, 300, 20);
    UILabel *mylabel = [[UILabel alloc]initWithFrame:frame];
    mylabel.text = @"这是动态创建的label";
    mylabel.backgroundColor = [UIColor clearColor];
    mylabel.font = [UIFont fontWithName:@"Verdana" size:20];
    mylabel.textColor = [UIColor lightGrayColor];
    mylabel.textAlignment = UITextAlignmentCenter;
    
    frame = CGRectMake(10, 70, 300, 50);
    //UIButton *mybutton = [[UIButton alloc]initWithFrame:frame];
    UIButton *mybutton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    mybutton.frame = frame;
    [mybutton setTitle:@"点我" forState:UIControlStateNormal];
    mybutton.backgroundColor = [UIColor clearColor];
    [mybutton addTarget:self action:@selector(buttonclc) forControlEvents:UIControlEventTouchUpInside];
    [myview addSubview:mylabel];
    [myview addSubview:mybutton];
    self.view = myview;
    [mylabel release];
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
}

解释下上面的代码：

上面代码有三段：

第一段创建的是UIView对象，它可以作为容器容纳其他视图。

第二段是创建一个Label视图。

第三段是创建一个UIButton视图。

注意，千万不要忘记将创建的视图加入第一步创建的view中，也不要忘记了将创建的view赋值给当前窗口的view：

[myview addSubview:mylabel];
    [myview addSubview:mybutton];
    self.view = myview;

[myview addSubview:mylabel];
    [myview addSubview:mybutton];
    self.view = myview;