RxSwift-中介者模式 Swift版

1、方法一 didMoveToParentViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(fireHome) userInfo:nil repeats:YES];
}

- (void)didMoveToParentViewController:(UIViewController *)parent{
    if (parent == nil) {
        [self.timer invalidate];
        self.timer = nil;
    }
    NSLog(@"我走了");
}

- (void)fireHome{
    num++;
    NSLog(@"hello word - %d",num);
}

- (void)dealloc{
    NSLog(@"%s",__func__);
}

2、方法二 block

- (void)viewDidLoad {
    [super viewDidLoad];
    self.timer = [NSTimer scheduledTimerWithTimeInterval:1 repeats:YES block:^(NSTimer * _Nonnull timer) {
        NSLog(@"hello word - ");
    }];
}

- (void)dealloc{
    [self.timer invalidate];
    self.timer = nil;
    NSLog(@"%s",__func__);
}

3、方法三 引入中间变量

@property (nonatomic, strong) id            target;

- (void)viewDidLoad {
    [super viewDidLoad];
    self.target = [[NSObject alloc] init];
    class_addMethod([self.target class], @selector(fireHomedyz), (IMP)fireHomeFunc, "v@:");
    self.timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self.target selector:@selector(fireHomedyz) userInfo:nil repeats:YES];
}

void fireHomeFunc(){
    NSLog(@"%s",__func__);
}

- (void)dealloc{
    [self.timer invalidate];
    self.timer = nil;
    NSLog(@"%s",__func__);
}

3、方法三 引入中间层

- (void)viewDidLoad {
    [super viewDidLoad];
    //self -> timerWapper(释放不了) </-/> timer <- runloop
    self.timerWapper = [[LGTimerWapper alloc] lg_initWithTimeInterval:1 target:self selector:@selector(fireHome) userInfo:nil repeats:YES];
}

- (void)fireHome{
    num++;
    NSLog(@"hello word - %d",num);
}

- (void)dealloc{
    [self.timerWapper lg_invalidate];
    NSLog(@"%s",__func__);
}

//LGTimerWapper.h
#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface LGTimerWapper : NSObject

- (instancetype)lg_initWithTimeInterval:(NSTimeInterval)ti target:(id)aTarget selector:(SEL)aSelector userInfo:(nullable id)userInfo repeats:(BOOL)yesOrNo;
- (void)lg_invalidate;

@end

NS_ASSUME_NONNULL_END

//LGTimerWapper.m
#import "LGTimerWapper.h"

@interface LGTimerWapper()
@property (nonatomic, weak) id target;
@property (nonatomic, assign) SEL aSelector;
@property (nonatomic, strong) NSTimer *timer;

@end

@implementation LGTimerWapper

- (instancetype)lg_initWithTimeInterval:(NSTimeInterval)ti target:(id)aTarget selector:(SEL)aSelector userInfo:(nullable id)userInfo repeats:(BOOL)yesOrNo{
    if (self == [super init]) {
        self.target     = aTarget;
        self.aSelector  = aSelector;
        self.timer      = [NSTimer scheduledTimerWithTimeInterval:ti target:self selector:@selector(fireHome) userInfo:userInfo repeats:yesOrNo];
    }
    return self;
}

- (void)fireHome{
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
    // 让编译器出栈，恢复状态，继续编译后续的代码！
    if ([self.target respondsToSelector:self.aSelector]) {
        [self.target performSelector:self.aSelector];
    }
#pragma clang diagnostic pop
}

- (void)lg_invalidate{
    [self.timer invalidate];
    self.timer = nil;
}

- (void)dealloc{
    NSLog(@"%s",__func__);
}

@end

3、方法三 中间层 NSProxy

- (void)viewDidLoad {
    [super viewDidLoad];
  
    self.proxy = [LGProxy proxyWithTransformObject:self];
    self.timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self.proxy selector:@selector(fireHome) userInfo:nil repeats:YES];

}

- (void)fireHome{
    num++;
    NSLog(@"hello word - %d",num);
}

- (void)dealloc{
    [self.timer invalidate];
    self.timer = nil;
    NSLog(@"%s",__func__);
}

//LGProxy.h
#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface LGProxy : NSProxy
+ (instancetype)proxyWithTransformObject:(id)object;
@end

NS_ASSUME_NONNULL_END

//LGProxy.m
#import "LGProxy.h"

@interface LGProxy()
@property (nonatomic, weak) id object;
@end

@implementation LGProxy
+ (instancetype)proxyWithTransformObject:(id)object{
    LGProxy *proxy = [LGProxy alloc];
    proxy.object = object;
    return proxy;
}

// sel - imp -
// 消息转发 self.object
- (NSMethodSignature *)methodSignatureForSelector:(SEL)sel{
    
    if (self.object) {
        
    }else{
        NSLog(@"麻烦收集 stack");
    }
    return [self.object methodSignatureForSelector:sel];
}

- (void)forwardInvocation:(NSInvocation *)invocation{
    
    if (self.object) {
        [invocation invokeWithTarget:self.object];
    }else{
        // add imp - 动态创建 - imp
        // imp 常规 -- pop
        // 收集奔溃信息
        NSLog(@"麻烦收集 stack");
    }
    
}

@end