Hello world for iphone
首先新建一个 base windows 的 project,名字为 HelloWorldEx
然后找到 HelloWorldExAppDelegate.m 修改函数
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
的内容为
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
UILabel *helloLabel = [[UILabel alloc] initWithFrame:CGRectMake(150, 150, 50, 50)];
[helloLabel setFont:[UIFont systemFontOfSize:17]];
[helloLabel setLineBreakMode:UILineBreakModeWordWrap];
[helloLabel setNumberOfLines:0];
// [helloLabel setBackgroundColor:[UIColor colorWithRed:120 green:220 blue:100 alpha:0.3]];
[helloLabel setText:@"hello World!"];
// [helloLabel setTextColor:[UIColor colorWithRed:20 green:100 blue:100 alpha:0.6]];
[self.window addSubview:helloLabel];
// [self.window setBackgroundColor:[UIColor blackColor]];
[self.window makeKeyAndVisible];
return YES;
}
然后再运行即可
这个例子,主要使用 UILabel 显示内容
UILabel 是一个显示静态文本的控件,它继承于 UIView
view 是显示内容的一个视图,view 可以嵌套 view
和 view 不同的是window,一个程序只有一个window,其相当于整个屏幕,是显示内容给用户的基础