#import "ViewController.h"

#import "Handler.h"

@interface ViewController ()

@property (copy) void (^myBlock)(void);

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

/*

// 1 声明块

double (^multiplyTwoValues)(double, double);

// 2 赋值

multiplyTwoValues = ^(double firstValue, double secondValue){

return firstValue * secondValue;

};

/* 块声明、赋值合并在一起

// 3 调用块

NSLog(@"multiplyTwoValues %f",multiplyTwoValues(1.1, 2));

[self testBlockStorageType];

Handler *handler = [[Handler alloc] init];

[handler addNumber:3 withNumber:5 andCompletionHandler:^(int result) {

NSLog(@"handler %i",result);

}];

}

- (void)testBlockStorageType{

__block int anInteger = 648;

// 用块获取局部变量的值

void (^myOperation)(void) = ^(void){

NSLog(@"Integer is %i",anInteger);

anInteger = 100;

};

myOperation();

NSLog(@"Value of original varialbe is now: %i",anInteger);

// 获取全局变量

void (^globalTest)(void) = ^(void){

NSLog(@"gGlobalVar is: %i",gGlobalVar);

gGlobalVar = 3;

};

gGlobalVar = 7;

globalTest();

NSLog(@"Value of original gGlobalVar is: %i",gGlobalVar);

}

- (void)configureMyBlock{

ViewController * __weak weakSelf = self;

self.myBlock = ^{

[weakSelf doSomething]; // Capture the weak reference to avoid the reference cycle

};

}

- (void)doSomething{

// do something

}