iOS开发——纯代码界面（UIViewController和文本类控件）

一、添加视图控制器（UIViewController）

创建一个ViewController类继承UIViewController
ViewController.m做如下修改

- (void)viewDidLoad {
    [super viewDidLoad];

    //为了方便观察，设置背景颜色为蓝色
    self.view.backgroundColor = [UIColor blueColor];

}

AppDelegate.m中做如下修改，记得导入ViewController类

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
    ViewController *view = [[ViewController alloc]init];
    self.window.rootViewController = view;
    [self.window makeKeyAndVisible];
    return YES;
}

运行程序就可以看到如下的界面

二、添加UILable，UITextField，UITextView（文本类控件）

UILable，UITextField，UITextView这几个控件是在上面添加了UIController的基础上添加的，同样修改ViewController.m

- (void)viewDidLoad {
    [super viewDidLoad];

    //为了方便观察，设置背景颜色为蓝色
    self.view.backgroundColor = [UIColor blueColor];

    //设置控件lable的位置
    UILabel *lable = [[UILabel alloc] initWithFrame:CGRectMake(50, 50, 150, 50)];

    //设置lable文本内容为I am UILable
    [lable setText:@"I am UILable"];

    //设置lable文本中的文字居中
    /*
     UITextAlignmentCenter 居中
     UITextAlignmentLeft 左对齐
     UITextAlignmentRight 右对齐
     */
    lable.textAlignment = UITextAlignmentCenter;

    //把lable控件添加到当前的View上
    [self.view addSubview:lable];

    //设置控件textField的位置
    UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(50, 100, 200, 200)];
    //设置控件textField的位置
    [textField setText:@"I am UITextField"];

    //把textField控件添加到当前的View上
    [self.view addSubview:textField];

    UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(50, 300, 200, 100)];

    [textView setText:@"I am UITextView"];

    [self.view addSubview:textView];
}

运行模拟器界面如下