iOS 多线程安全 与可变数组

完全来自于 iOS 多线程安全与可变字典 的学习

基本相同，举一反三

直接上样例代码

是我参照网上，根据当前业务需求改的。

其实好多人在这里喜欢用类别处理。我个人觉得用类别 极其容易和普通方法混淆，所以为了降低耦合度，增强代码理解性和可读性。这里单独创建类挺好的。用时候使用这个自定义的安全数组就好了。

// MensesTracker // // Created by HF on 2018/6/7. // Copyright © 2018年 huofar. All rights reserved. // #import <Foundation/Foundation.h>@interface SyncMutableArray : NSObject//只读 - (NSMutableArray *)safeArray;//判断是否包含对象 - (BOOL)containsObject:(id)anObject;//集合元素数量 - (NSUInteger)count;//获取元素 - (id)objectAtIndex:(NSUInteger)index; //枚举元素 - (NSEnumerator *)objectEnumerator; //插入 - (void)insertObject:(id)anObject atIndex:(NSUInteger)index; //插入 - (void)addObject:(id)anObject; //移除 - (void)removeObjectAtIndex:(NSUInteger)index; //移除 - (void)removeObject:(id)anObject; //移除 - (void)removeLastObject; //替换 - (void)replaceObjectAtIndex:(NSUInteger)index withObject:(id)anObject; //获取索引 - (NSUInteger)indexOfObject:(id)anObject;@end // // SyncMutableArray.m // MensesTracker // // Created by HF on 2018/6/7. // Copyright © 2018年 huofar. All rights reserved. // #import "SyncMutableArray.h"@interface SyncMutableArray ()@property (nonatomic, strong) dispatch_queue_t syncQueue; @property (nonatomic, strong) NSMutableArray* array;@end@implementation SyncMutableArray#pragma mark - init 方法 - (instancetype)initCommon {self = [super init];if (self) {//%p 以16进制的形式输出内存地址，附加前缀0xNSString* uuid = [NSString stringWithFormat:@"com.huofar.array_%p", self];//注意：_syncQueue是并行队列_syncQueue = dispatch_queue_create([uuid UTF8String], DISPATCH_QUEUE_CONCURRENT);}return self; }- (instancetype)init {self = [self initCommon];if (self) {_array = [NSMutableArray array];}return self; }//其他init方法略 #pragma mark - 数据操作方法 (凡涉及更改数组中元素的操作，使用异步派发+栅栏块；读取数据使用 同步派发+并行队列)- (NSMutableArray *)safeArray {__block NSMutableArray *safeArray;dispatch_sync(_syncQueue, ^{safeArray = _array;});return safeArray; }- (BOOL)containsObject:(id)anObject {__block BOOL isExist = NO;dispatch_sync(_syncQueue, ^{isExist = [_array containsObject:anObject];});return isExist; }- (NSUInteger)count {__block NSUInteger count;dispatch_sync(_syncQueue, ^{count = _array.count;});return count; }- (id)objectAtIndex:(NSUInteger)index {__block id obj;dispatch_sync(_syncQueue, ^{if (index < [_array count]) {obj = _array[index];}});return obj; }- (NSEnumerator *)objectEnumerator {__block NSEnumerator *enu;dispatch_sync(_syncQueue, ^{enu = [_array objectEnumerator];});return enu; }- (void)insertObject:(id)anObject atIndex:(NSUInteger)index {dispatch_barrier_async(_syncQueue, ^{if (anObject && index < [_array count]) {[_array insertObject:anObject atIndex:index];}}); }- (void)addObject:(id)anObject {dispatch_barrier_async(_syncQueue, ^{if(anObject){[_array addObject:anObject];}}); }- (void)removeObjectAtIndex:(NSUInteger)index {dispatch_barrier_async(_syncQueue, ^{if (index < [_array count]) {[_array removeObjectAtIndex:index];}}); }- (void)removeObject:(id)anObject {dispatch_barrier_async(_syncQueue, ^{[_array removeObject:anObject];//外边自己判断合法性 }); }- (void)removeLastObject {dispatch_barrier_async(_syncQueue, ^{[_array removeLastObject];}); }- (void)replaceObjectAtIndex:(NSUInteger)index withObject:(id)anObject {dispatch_barrier_async(_syncQueue, ^{if (anObject && index < [_array count]) {[_array replaceObjectAtIndex:index withObject:anObject];}}); }- (NSUInteger)indexOfObject:(id)anObject {__block NSUInteger index = NSNotFound;dispatch_sync(_syncQueue, ^{for (int i = 0; i < [_array count]; i ++) {if ([_array objectAtIndex:i] == anObject) {index = i;break;}}});return index; }- (void)dealloc {if (_syncQueue) {_syncQueue = NULL;} }@end

 

参考

1. https://www.aliyun.com/jiaocheng/354967.html

2.https://blog.csdn.net/zhang522802884/article/details/76728902

转载于:https://www.cnblogs.com/someonelikeyou/p/9151688.html

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