FishBind可以轻松的实现对象间消息的绑定。支持绑定属性、方法、block。支持单向绑定&双向绑定。
用这个做MVVM应该很愉快。
项目处于早期版本，仍在持续开发，如果喜欢这个lun zi，赶快一起来加功能、杀bug ー( ´ ▽ ` )ﾉ
- (void)viewDidLoad {
[super viewDidLoad];
//双向绑定
TestA *objA = [TestA new];
TestB *objB = [TestB new];
TestD *objD = [TestD new];
[IIFishBind bindFishes:@[
[IIFish both:objA property:@"name"
callBack:^(IIFishCallBack *callBack, id deadFish) {
[deadFish setUserName:callBack.args[0]];
}],
[IIFish both:objB property:@"bName"
callBack:^(IIFishCallBack *callBack, id deadFish) {
[deadFish setBName:callBack.args[0]];
}],
[IIFish both:objD
selector:@selector(setDK_Name:)
callBack:^(IIFishCallBack *callBack, id deadFish) {
[deadFish setDK_Name:[NSString stringWithFormat:@"DK_%@",callBack.args[0]]];
}]
]];
objA.name = @"json";
NSLog(@"%@", [NSString stringWithFormat:@"\nTestA : name = %@\nTestB : bName = %@\nTestD : DK_Name = %@",objA.userName, objB.bName, objD.DK_Name]);
/*
TestA : name = json
TestB : bName = json
TestD : DK_Name = DK_json
*/
objB.bName = @"GCD";
NSLog(@"%@", [NSString stringWithFormat:@"\nTestA : name = %@\nTestB : bName = %@\nTestD : DK_Name = %@",objA.userName, objB.bName, objD.DK_Name]);
/*
TestA : name = GCD
TestB : bName = GCD
TestD : DK_Name = DK_GCD
*/
objD.DK_Name = @"apple";
NSLog(@"%@", [NSString stringWithFormat:@"\nTestA : name = %@\nTestB : bName = %@\nTestD : DK_Name = %@",objA.userName, objB.bName, objD.DK_Name]);
/*
TestA : name = apple
TestB : bName = apple
TestD : DK_Name = apple
*/
// 绑定block
CGFloat (^testBlock)(CGFloat i, CGFloat j) = ^(CGFloat i, CGFloat j) {
return i + j;
};
[IIFishBind bindFishes:@[
[IIFish postBlock:testBlock],
[IIFish observer:self
callBack:^(IIFishCallBack *callBack, id deadFish) {
NSLog(@"%@ + %@ = %@", callBack.args[0], callBack.args[1], callBack.resule);
// 3.1 + 4.1 = 7.199999999999999
}]
]];
CGFloat value = testBlock (3.1, 4.1);
NSLog(@"value = %@", @(value));
// value = 7.199999999999999
// 单向绑定
[IIFishBind bindFishes:@[
[IIFish post:self selector:@selector(viewDidAppear:)],
[IIFish observer:self
callBack:^(IIFishCallBack *callBack, id deadFish) {
NSLog(@"======== 4 ===========");
}]
]];
[IIFishBind bindFishes:@[
[IIFish post:self selector:@selector(viewWillAppear:)],
[IIFish observer:self
callBack:^(IIFishCallBack *callBack, id deadFish) {
NSLog(@"======== 2 ===========");
}]
]];
}
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
NSLog(@"======== 1 ===========");
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
NSLog(@"======== 3 ===========");
}
pod 'FishBind'
现阶段，基本上就是搞几个IIFish，然后丢给IIFishBind。根据IIFish的语意不同，实现不同的逻辑。
下面是几种IIFish的初始化方式
// property bind
+ (instancetype)post:(id)object property:(NSString *)property;
+ (instancetype)observer:(id)object property:(NSString *)property;
// method bind
+ (instancetype)post:(id)object selector:(SEL)selector;
+ (instancetype)observer:(id)object callBack:(IIFishCallBackBlock)callBack;
// bind a block, using observer:callBack: to observe
+ (instancetype)postBlock:(id)blockObject;
// bilateral bind
+ (instancetype)both:(id)object selector:(SEL)selector callBack:(IIFishCallBackBlock)callBack;
+ (instancetype)both:(id)object property:(NSString *)property callBack:(IIFishCallBackBlock)callBack;;
比如，有对象A，希望监控其属性a的变化，则使用
IIFish *fish1 = [IIFish post:A property:@"a"];
然后，如果希望在a变化后，把a的值直接传给对象B的属性b， 则使用
IIFish *fish2 = [IIFish observer:B property:@"b"];
如果，只是希望像KVO一样观察事件，然后做一些复杂的操作，则使用
IIFish *fish2 = [IIFish observer:B callBack:^(IIFishCallBack *callBack, id deadFish) {
}];
IIFishCallBack 会把完整的信息交给你。IIFishCallBack结构如下
@interface IIFishCallBack : NSObject
@property (nonatomic, weak) id tager; //被观察者
@property (nonatomic, copy) NSString *selector; //被调用的方法
@property (nonatomic, strong) NSArray *args; // 该方法的参数的值
@property (nonatomic, strong) id resule; // 方法的返回值
@end
而deadFish是什么呢？在本例中，deadFish可以理解为对象B，即观察者。假设B有一个方法test被C监控，调用[B test]，C会收到回调。调用[deadFish test]，C不会收到回掉（为什么要设计这个，在下文有介绍）。
最后把两个IIFish对象交给IIFishBind，就完成了绑定，代码如下。
[IIFishBind bindFishes:[fish1,fish2]];
绑定属性其实就是绑定方法。本质上没区别。
在使用上，被监控的对象需要使用
+ (instancetype)post:(id)object selector:(SEL)selector;
观察者也必须使用
+ (instancetype)observer:(id)object callBack:(IIFishCallBackBlock)callBack;
其实就是钩一个block。在block执行后加一些自己的代码。（感觉上可以做block队列，或者block事件发给多个接收者。不过实际上没遇见这种需求，纯粹是为了好玩才写的.....）
流程上和上面一样。使用下面的方法初始化IIFish。
+ (instancetype)postBlock:(id)blockObject;
+ (instancetype)observer:(id)object callBack:(IIFishCallBackBlock)callBack;
最后绑定一下就好了。
[IIFishBind bindFishes:XXXXX];
单向绑定的话，属性可以用KVO，方法可以用Aspects，基本都是现成的方案。写这个的目的主要是为了实现双向绑定。
比如，有对象A、B、C，分别有属性a、b、c。三个属性内容一样，希望这三个属性有一个被更改，其它两个跟着被更改。则代码如下
[IIFishBind bindFishes:@[
[IIFish both:A property:@"a" callBack:nil],
[IIFish both:B property:@"b" callBack:nil],
[IIFish both:C property:@"c" callBack:nil]
]];
如果，对象B的属性b，需要特殊处理，比如是a c的100倍，则如下。
[IIFishBind bindFishes:@[
[IIFish both:A property:@"a" callBack:^(IIFishCallBack *callBack, id deadFish) {
deadFish.a = [callback.arg[0] intValue] / 100;
}]，
[IIFish both:C property:@"c" callBack:^(IIFishCallBack *callBack, id deadFish) {
deadFish.c = [callback.arg[0] intValue] / 100;
}]，
[IIFish both:B selector:@selector(setB:) callBack:^(IIFishCallBack *callBack, id deadFish) {
deadFish.b = 100 * [callback.arg[0] intValue];
}]
]];
这里，如果调用 B.b则回会造成死循环，所以需要使用deadFish。
+ (instancetype)both:(id)object selector:(SEL)selector callBack:(IIFishCallBackBlock)callBack;
+ (instancetype)both:(id)object property:(NSString *)property callBack:(IIFishCallBackBlock)callBack;
使用Both开头的API初始化的IIFish，表示既可以发送改变也可以接受改变。
一组中， 如果有使用both:selector:callBack:，则这一组都需要实现callBack，来实现回调行为。
目前callBack没有优先级，调用顺序不确定，不应该在callBack中直接获取这一组的其他值。
- 兼容KVO