@interface MyView : UIView

@property (strong, nonatomic) UIButton *myBtn;

@end

#import "MyView.h" 

@implementation MyView
//view的初始化方法
- (id)initWithFrame:(CGRect)frame
{
 self = [super initWithFrame:frame];
 if (self)
 { //初始化按钮
 _myBtn = [[UIButton alloc] initWithFrame:CGRectMake(140, 100, 100, 50)];
 _myBtn.backgroundColor = [UIColor redColor];
 //将按钮添加到自身
 [self addSubview:_myBtn];
 }
 return self;
}

@end

#import <UIKit/UIKit.h>

@interface MyViewController : UIViewController

@end

#import "MyViewController.h"
#import "MyView.h"

@interface MyViewController ()

@property (strong, nonatomic) MyView *myview;

@end

@implementation MyViewController

- (void)loadView
{
 MyView *myView = [[MyView alloc] initWithFrame: [[UIScreen mainScreen] bounds] ];
 self.view = myView;
 self.myview = myView;
 
 //在controller中设置按钮的目标-动作，其中目标是self，也就是控制器自身，动作是用目标提供的BtnClick:方法，
 [self.myview.myBtn addTarget:self
    action:@selector(BtnClick:)
  forControlEvents:UIControlEventTouchUpInside];
}

//MyView中的按钮的事件
- (void)BtnClick:(UIButton *)btn
{
 NSLog(@"Method in controller.");
 NSLog(@"Button clicked.");
}

 #import "AppDelegate.h"
#import "MyViewController.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
 
 self.window = [ [UIWindow alloc] initWithFrame: [[UIScreen mainScreen] bounds ] ];
 
 MyViewController *myVC = [[MyViewController alloc] init];
 self.window.rootViewController = myVC;
 
 self.window.backgroundColor = [UIColor whiteColor];
 [self.window makeKeyAndVisible];
   
 return YES;
}