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//
// ViewController.m
// Block
//
// Created by ad on 08/06/2017.
//
// 详细博文介绍：https://github.com/pro648/tips/wiki/Block%E7%9A%84%E7%94%A8%E6%B3%95
#import "ViewController.h"
#import "Handler.h"
@interface ViewController ()
@property (copy) void (^myBlock)(void);
@end
//static int age = 20;
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
/*
// 块的声明
int (^firstBlock)(NSString *param1, int param2); // 返回类型为int 参数1为NSString类型 参数2为int类型
void (^showName)(NSString *pro648); // 无返回内容 参数为NSString类型
void (^allVoid)(void); // 无返回内容 不传递参数
NSDate *(^whatDayIsIt)(void); // 返回类型为NSDate 不传递参数
NSString *(^composeName)(NSString *, NSString *); // 返回类型为NSString 两个参数均为NSString类型 参数名称可以省略
*/
// 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
double (^multiplyTwoValues)(double, double) = ^(double firstValue, double secondValue){
return firstValue * secondValue;
};
*/
// 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;
};
// anInteger = 64;
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{
// self.myBlock = ^{
// [self doSomething]; // Capturing a strong reference to self
// // Create a strong reference cycle
// };
ViewController * __weak weakSelf = self;
self.myBlock = ^{
[weakSelf doSomething]; // Capture the weak reference to avoid the reference cycle
};
}
- (void)doSomething{
// do something
}
@end