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  • 完全靠代码生成的ios版hello,world

    xcode5 运行在iphone retain 3.5" 模式下(即对应iphone4, iphone4s)需要开启ARC

    //
    //  main.m
    //  Hello
    //
    //  Created by lishujun on 14-8-28.
    //  Copyright (c) 2014年 lishujun. All rights reserved.
    //
    
    #import <UIKit/UIKit.h>
    
    
    // 视图控制器对象
    @interface HelloWorldViewController : UIViewController
    @end
    
    @implementation HelloWorldViewController
    
    -(void) loadView
    {
        //创建视图对象
        UIView *contentView = [[UIView alloc]initWithFrame:[[UIScreen mainScreen] applicationFrame]];
        contentView.backgroundColor = [UIColor lightGrayColor];
        self.view = contentView;
        
        //创建label对象
        UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(0.0, 0.0, 320.0, 30.0)];
        label.text = @"Hello World";
        label.center = contentView.center;             // 垂直居中
        label.textAlignment = UITextAlignmentCenter;   // 水平居中
        label.backgroundColor = [UIColor clearColor];
        label.textColor = [UIColor redColor];
        
        //在视图上添加label
        [contentView addSubview:label];
    }
    
    @end
    
    
    // 委托对象
    @interface HelloWorldAppDelegate : NSObject <UIApplicationDelegate>
    {
        IBOutlet UIWindow *window;
    }
    
    @property (nonatomic, retain) UIWindow *window;
    //必须声明为属性,声明为局部变量则无法绘制视图,显示为黑屏
    @end
    
    @implementation HelloWorldAppDelegate
    @synthesize window;
    
    -(void) applicationDidFinishLaunching:(UIApplication *)application
    {
        self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen]bounds]];
        HelloWorldViewController *viewController = [[HelloWorldViewController alloc]init];
        self.window.rootViewController = viewController;
        [self.window makeKeyAndVisible];
    }
    
    @end
    
    // 程序入口
    int main(int argc, char * argv[])
    {
        @autoreleasepool {
            return UIApplicationMain(argc, argv, nil, @"HelloWorldAppDelegate");
        }
    }
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  • 原文地址:https://www.cnblogs.com/code-style/p/3943902.html
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