iOS 개발 학습 노트--objective-c의 Block 초보자

블락 소개

블록 구문 정의

int (^myBlocks)(int);

myBlocks = ^(int a){
    int result = a * a;
    return result;
}

int ret = myBlocks(10);

typedef int (^MathBlock)(int, int);
MathBlock mulBlock;
mulBlock = ^(int a, int b){
   
        return a * b;
};
NSLog(@"a*b = %d", mulBlock(2, 3));

Block 대상 간 통신 구현(보모와 아이 문제)

#import 
@interface Child : NSObject

typedef void(^HandleChildBlock)(Child *);
// 
@property(nonatomic, assign)NSInteger cleanValue;
//Block copy
@property(nonatomic, copy)HandleChildBlock washBlock;

@end

#import "Child.h"

@implementation Child

- (instancetype)init
{
    self = [super init];
    if (self) {
        _cleanValue = 100;
        // ， ， 
        [NSTimer scheduledTimerWithTimeInterval:1
                                         target:self
                                       selector:@selector(timerAction:)
                                       userInfo:nil
                                        repeats:YES];
    }
    return self;
}

- (void)timerAction:(NSTimer *)timer {
    
    NSLog(@"cleacValue:%lu", _cleanValue);
    _cleanValue--;
    
    if (_cleanValue == 95) {
        // 95 ， 
        if (self.washBlock) {
            
            _washBlock(self);
        
        }
        
    }
    
}

@end

#import 
@class Child;

@interface Nanny : NSObject

- (void)washChild:(Child *)child;

@end

#import "Nanny.h"
#import "Child.h"

@implementation Nanny

- (void)washChild:(Child *)child {
    
    child.washBlock = ^(Child *ch){
        //Block 
        NSLog(@" ");
        ch.cleanValue = 100;
        
    };
}
@end