iOS NSTimer循环引用的办法

#import "LXFTimerView.h"@interface LXFTimerView()/** 定时器 */@property(nonatomic, weak) NSTimer *timer;@end@implementation LXFTimerView- (instancetype)initWithFrame:(CGRect)frame {  if (self = [super initWithFrame:frame]) {    [self addTimer];  }  return self;}- (void)dealloc {  NSLog(@"LXFTimerView - dealloc");  [self removeTimer];}#pragma mark - 定时器方法/** 添加定时器方法 */- (void)addTimer {  // 创建定时器  if (self.timer) { return; }  self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(log) userInfo:nil repeats:YES];  [[NSRunLoop currentRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];}/** 移除定时器 */- (void)removeTimer {  [self.timer invalidate];  self.timer = nil;}- (void)log {  NSLog(@"定时器 -- %s", __func__);}@end

#import "ViewController.h"#import "LXFTimerView.h"@interface ViewController ()/** timerView */@property(nonatomic, weak) LXFTimerView *timerView;@end@implementation ViewController- (void)viewDidLoad {  [super viewDidLoad];  LXFTimerView *timerView = [[LXFTimerView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, 200)];  timerView.backgroundColor = [UIColor orangeColor];  self.timerView = timerView;  [self.view addSubview:timerView];  }- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {  [self.timerView removeFromSuperview];}@end

[NSTimer scheduledTimerWithTimeInterval: target: selector: userInfo: repeats:];

#import <Foundation/Foundation.h>@interface LXFWeakTarget : NSObject+ (NSTimer *)scheduledTimerWithTimeInterval:(NSTimeInterval)ti target:(id)aTarget selector:(SEL)aSelector userInfo:(nullable id)userInfo repeats:(BOOL)yesOrNo;@end

#import "LXFWeakTarget.h"@interface LXFWeakTarget()@property(nonatomic, weak) id target;@property(nonatomic, assign) SEL selector;@end@implementation LXFWeakTarget+ (NSTimer *)scheduledTimerWithTimeInterval:(NSTimeInterval)ti target:(id)aTarget selector:(SEL)aSelector userInfo:(nullable id)userInfo repeats:(BOOL)yesOrNo {  // 创建当前类的对象  LXFWeakTarget *object = [[LXFWeakTarget alloc] init];  object.target = aTarget;  object.selector = aSelector;  return [NSTimer scheduledTimerWithTimeInterval:ti target:object selector:@selector(execute:) userInfo:userInfo repeats:yesOrNo];}- (void)execute:(id)obj {  [self.target performSelector:self.selector withObject:obj]; }@end

#import "LXFWeakTarget.h"