IOS初始化控制器的实现方法总结

#import "AppDelegate.h"
#import "ViewController.h"

@interface AppDelegate ()

@property(nonatomic,strong) ViewController *viewController;

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

  //初始化控制器
  self.viewController = [[ViewController alloc]init];
  //初始化window
  self.window =[[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
  //设置控制器
  self.window.rootViewController = self.viewController;

  return YES;
}

#import "AppDelegate.h"

#import "XibViewControllViewController.h"

@interface AppDelegate ()

@property(nonatomic,strong) ViewController *viewController;
@property(nonatomic,strong) XibViewControllViewController *xibControllViewController;

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

  //初始化控制器
  self.xibControllViewController = [[XibViewControllViewController alloc]initWithNibName:@"XibViewControllViewController" bundle:nil];
  //初始化window
  self.window =[[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
  //设置控制器
  self.window.rootViewController = self.xibControllViewController;


  return YES;
}