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;}