UI控件--推送，以及Block块

//AppDelegate.m的实现文件

import “AppDelegate.h”

import “AViewController.h”

@interface AppDelegate ()

@end

@implementation AppDelegate

• (BOOL)application:(UIApplication )application didFinishLaunchingWithOptions:(NSDictionary )launchOptions {
  // Override point for customization after application launch.

  self.window.backgroundColor = [UIColor whiteColor];
  AViewController *aViewController = [AViewController new];
  self.window.rootViewController = [[UINavigationController alloc] initWithRootViewController:aViewController];

  return YES;
  }

• (void)applicationWillResignActive:(UIApplication *)application {
  // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
  // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
  }

• (void)applicationDidEnterBackground:(UIApplication *)application {
  // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
  // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
  }

• (void)applicationWillEnterForeground:(UIApplication *)application {
  // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
  }

• (void)applicationDidBecomeActive:(UIApplication *)application {
  // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
  }

• (void)applicationWillTerminate:(UIApplication *)application {
  // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
  }

@end
//ViewController.m文件

import “ViewController.h”

@interface ViewController ()

@end

@implementation ViewController

int *function(int number){
int *XX = function(5);
return XX;

}

• (void)viewDidLoad {
  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.

  /*

  Block
  什么是Block？
  block是C级别的匿名函数块，和C语言的函数指针很像，在IOS4，0之后就开始支持Block
  在IOS开发中什么情况使用block
  1、代码的封装
  2、并发任务的执行
  3、回调

  block块语法：

  */
  //block块的声明
  int (^wangweilin)(int n1,int n2);

  //block块的实现
  wangweilin = ^(int n1,int n2) {

  return n1 + n2;

  };

  //block的调用
  int result = wangweilin(1,1);

  NSLog(@”result = %d”,result);

  void (^lifurong)(NSString *string) = ^(NSString *string) {

  NSLog(@"string = %@",string);

  };

  lifurong(@”666”);

}

• (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
  }

@end
//创建两个继承于ViewController的类，并且带有xib文件
//下面是AViewController.m文件

import “AViewController.h”

import “BViewController.h”

@interface AViewController ()
@property (strong, nonatomic) IBOutlet UILabel *label;

@end

@implementation AViewController
- (IBAction)button:(id)sender {

BViewController *bViewController = [BViewController new];bViewController.block = ^(NSString *string){    self.label.text = string;};[self.navigationController pushViewController:bViewController animated:YES];

}

• (void)viewDidLoad {
  [super viewDidLoad];
  // Do any additional setup after loading the view from its nib.
  self.view.backgroundColor = [UIColor greenColor];;
  }

• (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
  }

/*

pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/

@end
//BViewController.h文件

import

import “BViewController.h”

@interface BViewController ()
@property (strong, nonatomic) IBOutlet UITextField *textField;

@end

@implementation BViewController
- (IBAction)button:(id)sender {

self.block(self.textField.text);[self.navigationController popViewControllerAnimated:YES];

}

• (void)viewDidLoad {
  [super viewDidLoad];
  // Do any additional setup after loading the view from its nib.
  }

• (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
  }

/*

pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/

@end