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2017-08-15 16:59:01 +08:00
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+//
+//  YYWeakProxy.h
+//  YYKit <https://github.com/ibireme/YYKit>
+//
+//  Created by ibireme on 14/10/18.
+//  Copyright (c) 2015 ibireme.
+//
+//  This source code is licensed under the MIT-style license found in the
+//  LICENSE file in the root directory of this source tree.
+//
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ A proxy used to hold a weak object.
+ It can be used to avoid retain cycles, such as the target in NSTimer or CADisplayLink.
+ 
+ sample code:
+ 
+     @implementation MyView {
+        NSTimer *_timer;
+     }
+     
+     - (void)initTimer {
+        YYWeakProxy *proxy = [YYWeakProxy proxyWithTarget:self];
+        _timer = [NSTimer timerWithTimeInterval:0.1 target:proxy selector:@selector(tick:) userInfo:nil repeats:YES];
+     }
+     
+     - (void)tick:(NSTimer *)timer {...}
+     @end
+ */
+@interface YYWeakProxy : NSProxy
+
+/**
+ The proxy target.
+ */
+@property (nullable, nonatomic, weak, readonly) id target;
+
+/**
+ Creates a new weak proxy for target.
+ 
+ @param target Target object.
+ 
+ @return A new proxy object.
+ */
+- (instancetype)initWithTarget:(id)target;
+
+/**
+ Creates a new weak proxy for target.
+ 
+ @param target Target object.
+ 
+ @return A new proxy object.
+ */
+ (instancetype)proxyWithTarget:(id)target;
+
+@end
+
+NS_ASSUME_NONNULL_END