IOS 使用XIB进行开发

1 如果要使用XIB进行UI的绘制，我们先要删掉Main.storyboad
2
3 修改AppDelegate 代码
（1) AppDelegate.h 修改成

#import <UIKit/UIKit.h>
#import "MainViewController.h"

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;//默认有的

@property (strong, nonatomic) MainViewController *viewController;//你自己定义的控制器


@end

（1) AppDelegate.m 修改 didFinishLaunchingWithOptions 方法

- (BOOL)application:(UIApplication *)application
        didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    //创建Window 并初始化窗口大小，
    self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]];
    //初始化该视图控制器关联用户UI 
    self.viewController = [[MainViewController alloc]initWithNibName:@"MainViewController" bundle:nil];
    //该窗口与视图关联用户UI 
    self.window.rootViewController = self.viewController;
    //该UIWindow 对象设为主窗口，并显示出来
    [self.window makeKeyAndVisible];

    return YES;
}