1. 使用block
__weak typeof(self) weakSelf = self;
self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 repeats:YES block:^(NSTimer * _Nonnull timer) {
[weakSelf timerTest];
}];
2. 利用Runtime的消息转发机制
//.h
@interface YZTimerProxy : NSProxy
+ (instancetype)proxyWithTarget:(id)target;
@property (weak, nonatomic) id target;
@end
//.m
@implementation YZTimerProxy
+ (instancetype)proxyWithTarget:(id)target {
// NSProxy对象不需要调用init，因为它本来就没有init方法
YZTimerProxy *proxy = [YZTimerProxy alloc];
proxy.target = target;
return proxy;
}
- (NSMethodSignature *)methodSignatureForSelector:(SEL)sel {
return [self.target methodSignatureForSelector:sel];
}
- (void)forwardInvocation:(NSInvocation *)invocation {
[invocation invokeWithTarget:self.target];
}
@end
self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:[YZTimerProxy proxyWithTarget:self] selector:@selector(timerTest) userInfo:nil repeats:YES];
