pod 'KVOController'
@interface TestModel : NSObject
@property (nonatomic,strong)NSString *name;
@property (nonatomic,assign)int age;
@end
@implementation TestModel
@end
------------------------------------------------
#import "KVOBaseUsesViewController_14.h"
#import "KVOBaseUsesViewController_14_2.h"
#import <KVOController/KVOController.h>
@interface KVOBaseUsesViewController_14 ()
@property (nonatomic,strong)TestModel *t;
@property (nonatomic,strong)FBKVOController *fbKVOController;
@end
@implementation KVOBaseUsesViewController_14
- (void)viewDidLoad {
[super viewDidLoad];
//初始化：方式1 (类方法)
self.fbKVOController = [FBKVOController controllerWithObserver:self];
//初始化：方式2 （实例方法）
self.fbKVOController = [[FBKVOController alloc]initWithObserver:self];
//初始化：方式3 （实例方法） 持有 默认YES
self.fbKVOController = [[FBKVOController alloc]initWithObserver:self retainObserved:YES];
//初始化：方式4 （实例方法） 不持有
self.fbKVOController = [[FBKVOController alloc]initWithObserver:self retainObserved:NO];
-------------------------------------------------------------
//监听：方式1 通过SEL来监听
[self.fbKVOController observe:self.t keyPath:@"name" options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld action:@selector(propertyHasChanged:)];
//监听：方式2 通过block来监听
[self.fbKVOController observe:self.t keyPath:@"age" options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld block:^(id _Nullable observer, id _Nonnull object, NSDictionary<NSString *,id> * _Nonnull change) {
NSLog(@"监听者%@监听到%@的属性值改变了 - %@",observer, object, change);
}];
//监听：方式3 带上下文 实现：observeValueForKeyPath方法来监听
[self.fbKVOController observe:self.t keyPath:@"age" options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld context:@"theWay3"];
//监听：方式4 可以监听多个属性 通过SEL来监听
[self.fbKVOController observe:self.t keyPaths:@[@"name",@"age"] options:NSKeyValueObservingOptionNew |NSKeyValueObservingOptionOld action:@selector(propertyHasChanged:)];
//监听：方式5 可以监听多个属性 通过block监听
[self.fbKVOController observe:self.t keyPaths:@[@"name",@"age"] options:NSKeyValueObservingOptionNew |NSKeyValueObservingOptionOld block:^(id _Nullable observer, id _Nonnull object, NSDictionary<NSString *,id> * _Nonnull change) {
NSLog(@"监听者%@监听到%@的属性值改变了 - %@",observer, object, change);
}];
//监听：方式6 可以监听多个属性 带上下文 实现：observeValueForKeyPath方法来监听
[self.fbKVOController observe:self.t keyPaths:@[@"name",@"age"] options:NSKeyValueObservingOptionNew |NSKeyValueObservingOptionOld context:@"theWay6"];
}
//通过上下文的方法来监听的（实现监听方法）
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context{
NSLog(@"监听到%@的%@属性值改变了 - %@ - %@", object, keyPath, change, context);
}
//通过SEL的方法来监听的（实现监听方法）
-(void)propertyHasChanged:(id)sender{
NSLog(@"属性改变啦：%@",sender);
}
//点击修改属性
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
self.t.name = @"Lucy";
self.t.age = 18;
}
-(void)dealloc{
//注销方式1
[self.fbKVOController unobserve:self.t keyPath:@"name"];
//[self.fbKVOController unobserve:self.t keyPath:@"name"]; 过多的移除不会崩溃哟
//注销方式2
[self.fbKVOController unobserve:self.t];
// [self.fbKVOController unobserve:self.t]; 过多的移除不会崩溃哟
//注销方式3
[self.fbKVOController unobserveAll];
NSLog(@"%s",__FUNCTION__);
}
我们再细看初始化：方式3 和方式4（是否持有）
- (void)viewDidLoad {
[super viewDidLoad];
UIButton *jumpBtn = [UIButton new];
jumpBtn.frame = CGRectMake(20, 100, 150, 80);
[self.view addSubview:jumpBtn];
[jumpBtn setTitle:@"跳转VC" forState:UIControlStateNormal];
[jumpBtn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
[jumpBtn addTarget:self action:@selector(jump) forControlEvents:UIControlEventTouchUpInside];
self.t = [[TestModel alloc]init];
//设置监听者为 self
//持有
self.fbKVOController = [[FBKVOController alloc]initWithObserver:self retainObserved:YES];
//不持有
self.fbKVOController = [[FBKVOController alloc]initWithObserver:self retainObserved:NO];
}
-(void)propertyHasChanged:(id)sender{
NSLog(@"属性改变啦：%@",sender);
}
-(void)jump{
KVOBaseUsesViewController_14_2* vc2 = [KVOBaseUsesViewController_14_2 new];
vc2.vc1 = self;
//设置监听的对象是vc2,监听的属性是vc1.t.name
[self.fbKVOController observe:vc2 keyPath:@"vc1.t.name" options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld action:@selector(propertyHasChanged:)];
[self.navigationController pushViewController:vc2 animated:YES];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
self.t.name = @"Jack";
self.t.age = 16;
});
}
-(void)dealloc{
//注销
[self.fbKVOController unobserveAll];
NSLog(@"%s",__FUNCTION__);
}
KVOBaseUsesViewController_14_2.h
#import <UIKit/UIKit.h>
#import "KVOBaseUsesViewController_14.h"
@interface KVOBaseUsesViewController_14_2 : UIViewController
@property (nonatomic,strong)KVOBaseUsesViewController_14 *vc1;
@end
KVOBaseUsesViewController_14_2.m
#import "KVOBaseUsesViewController_14_2.h"
@interface KVOBaseUsesViewController_14_2 ()
@end
@implementation KVOBaseUsesViewController_14_2
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
}
-(void)dealloc{
NSLog(@"%s",__FUNCTION__);
}
@end
分析：
1.当 设置retained的为YES,持有，则2个控制器都不会被释放（没有走dealloc的方法）
2.当 设置retained的为NO,不持有，则2个控制器会被释放（走dealloc的方法）
首先我们看下该框架的文件
KVOController.h
FBKVOController.h
FBKVOController.m
NSObject+FBKVOController.h
NSObject+FBKVOController.m
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我们从上面的类分析有如下图关系：
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具体的代码实现及说明：可参考写的gitHubDemo里面主要的步骤都加了注释
友情链接：
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