蓝鸥iOS从零基础到精通就业－OC语言入门 Block

• iOS从零基础到精通就业 Objective-C
  
• CSDN观看地址：http://edu.csdn.net/course/detail/3347
• Block
  

• #import 
  
  int number1 = 10000;
  
  int sum(int a,int b);
  int sum(int a,int b)
  {
       number1 = 100;
      return a+b;
   
  }
  
  int main(int argc, const char * argv[]) {
      
      number1 = 100;
      //block语法
      //^block的标示符
      /*
        返回值 （^名字）（参数）= ^(参数){
  
       }
       */
      
      
     __block int number = 10;
      void(^myBlock)() = ^(){
          NSLog(@"这是一个最简单的block");
          //block内部不能直接使用局部变量的 需要加__block 可以直接使用全局变量
          number = 100;
          number1 = 1000000;
      };
      myBlock();
      
      
      int(^sumBlock)(int,int) = ^(int a,int b){
          return a+b;
      };
      NSLog(@"%d",sumBlock(10,20));
      
      
      int(^maxBlock)(int,int) = ^(int a,int b){
          return a>b?a:b;
      };
      NSLog(@"%d",maxBlock(30,50));
      
      
      typedef int(^thisBlock)(int,int);
      
      thisBlock block1 = ^(int a,int b){
          return a-b;
      };
      
      thisBlock block2 = ^(int a,int b)
      {
          return a*b;
      };
  
      
      
      
          return 0;
  }