NSTimer不销毁，内存泄漏解决方案

//不调用dealloc方法
[NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(fire) userInfo:nil repeats:YES];

self.timer = [NSTimer timerWithTimeInterval:0.1 target:self selector:@selector(fire) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:self.timer forMode:NSDefaultRunLoopMode];

方案一,使用ViewController生命周期方法

//当从一个视图控制容器中添加或者移除viewController后，该方法被调用。
//parent：父视图控制器，如果没有父视图控制器，将为nil
-(void)didMoveToParentViewController:(UIViewController *)parent{
if (parent == nil) {
    [self.timer invalidate];
    self.timer = nil;
    }
}

方案二，不让timer强引用self,自定义一个target,通过消息转发接收

@property (nonatomic , strong) id target;

//自定义target
self.target = [NSObject new];
//添加消息转发
class_addMethod([_target class], @selector(fire), (IMP)fireImp, "v@:");
self.timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:_target selector:@selector(fire) userInfo:nil repeats:YES];

//消息转发函数
void fireImp (id self,SEL _cmd){
    NSLog(@"fire...fire");
}
-(void)dealloc{
    NSLog(@"销毁");
    [self.timer invalidate];
    self.timer = nil;
}

方案三，NSProxy

继承NSProxy

.h

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface WSProxy : NSProxy

@property (nonatomic , weak) id target;

@end

NS_ASSUME_NONNULL_END

.m

#import "WSProxy.h"
#import <objc/message.h>
@implementation WSProxy
//方法签名
-(NSMethodSignature *)methodSignatureForSelector:(SEL)sel{
    return [self.target methodSignatureForSelector:sel];
}
//转发给一个真正实现了该消息的对象
-(void)forwardInvocation:(NSInvocation *)invocation{
    [invocation invokeWithTarget:self.target];
}

@end

ViewController实现方法

@property (nonatomic , strong) WSProxy *wsProxy;

_wsProxy = [WSProxy alloc];
_wsProxy.target = self;
self.timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:_wsProxy  selector:@selector(fire) userInfo:nil repeats:YES];

-(void)dealloc{
    NSLog(@"销毁");
    [self.timer invalidate];
    self.timer = nil;
}