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IOS多线程（NSThread，NSOperation，Grand Central Dispatch)

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        IOS多线程（NSThread，NSOperation，Grand Central Dispatch)            
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<p style="margin:10px auto; font-family:Verdana,Geneva,Arial,Helvetica,sans-serif; font-size:13px; line-height:20.796875px">
<strong>文档转自：http://www.cnblogs.com/BinShao/p/zhibin.html</strong></p>
<p style="margin:10px auto; font-family:Verdana,Geneva,Arial,Helvetica,sans-serif; font-size:13px; line-height:20.796875px">
<strong>•NSThread</strong>:</p>
<div class="O1" style="font-family:Verdana,Geneva,Arial,Helvetica,sans-serif; font-size:13px; line-height:20.796875px">
　　–优点：NSThread 比其他两个轻量级，使用简单</div>
<div class="O1" style="font-family:Verdana,Geneva,Arial,Helvetica,sans-serif; font-size:13px; line-height:20.796875px">
　　–缺点：需要自己管理线程的生命周期、线程同步、加锁、睡眠以及唤醒等。线程同步对数据的加锁会有一定的系统开销</div>
<div class="O1" style="font-family:Verdana,Geneva,Arial,Helvetica,sans-serif; font-size:13px; line-height:20.796875px">
&nbsp;</div>
<div style="font-family:Verdana,Geneva,Arial,Helvetica,sans-serif; font-size:13px; line-height:20.796875px">
<strong>•NSOperation</strong>：</div>
<p style="margin:10px auto; font-family:Verdana,Geneva,Arial,Helvetica,sans-serif; font-size:13px; line-height:20.796875px">
&nbsp;　　–不需要关心线程管理，数据同步的事情，可以把精力放在自己需要执行的操作上</p>
<p style="margin:10px auto; font-family:Verdana,Geneva,Arial,Helvetica,sans-serif; font-size:13px; line-height:20.796875px">
&nbsp;　　–NSOperation是面向对象的</p>
<p style="margin:10px auto; font-family:Verdana,Geneva,Arial,Helvetica,sans-serif; font-size:13px; line-height:20.796875px">
&nbsp;<span style="line-height:19px">　　<span style="color:rgb(255,0,0)">- (void)performSelectorOnMainThread:(SEL)aSelector withObject:(id)arg waitUntilDone:(BOOL)wait;</span></span></p>
<div style="font-family:Verdana,Geneva,Arial,Helvetica,sans-serif; font-size:13px; line-height:20.796875px">
•如果要更新UI界面，可以在后台线程中调用<span style="line-height:19px; color:rgb(255,0,0)">performSelectorOnMainThread</span>方法</div>
<div style="font-family:Verdana,Geneva,Arial,Helvetica,sans-serif; font-size:13px; line-height:20.796875px">
&nbsp;</div>
<div class="O1" style="font-family:Verdana,Geneva,Arial,Helvetica,sans-serif; font-size:13px; line-height:20.796875px">
<span style="line-height:19px">•提示</span>：尽管使用performSelectorInBackground方法调用的任务可以更新UI界面，但是在实际开发中，涉及到UI界面的更新操作，还是要使用performSelectorOnMainThread　　　方法，以避免不必要的麻烦</div>
<div class="O1" style="font-family:Verdana,Geneva,Arial,Helvetica,sans-serif; font-size:13px; line-height:20.796875px">
&nbsp;</div>
<div class="O1" style="font-family:Verdana,Geneva,Arial,Helvetica,sans-serif; font-size:13px; line-height:20.796875px">
<div>•开启后台执行任务的方法</div>
<div>&nbsp;</div>
<div class="O1">　<span style="line-height:19px">　<span style="color:rgb(255,0,0)">-(void)performSelectorInBackground:(SEL)aSelector withObject:(id)arg</span></span></div>
<div class="O1">&nbsp;</div>
<div>•在后台线程中通知主线程执行任务的方法</div>
<div>&nbsp;</div>
<div class="O1">　<span style="line-height:19px; color:rgb(255,0,0)">　–(void)performSelectorOnMainThread:(SEL)aSelector withObject:(id)arg waitUntilDone:(BOOL)wait;</span></div>
<div class="O1">&nbsp;</div>
<div>•获取线程信息</div>
<div>&nbsp;</div>
<div>　<span style="line-height:19px">　<span style="color:rgb(255,0,0)">[NSThread currentThread];</span></span></div>
<div>&nbsp;</div>
<div>•线程休眠</div>
<div>&nbsp;</div>
<div>　　<span style="line-height:19px; color:rgb(255,0,0)">[NSThread sleepForTimeInterval:1.0f];</span></div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div class="O1"><span style="line-height:19px; color:rgb(255,0,0)">　+ (void)detachNewThreadSelector:(SEL)selector toTarget:(id)target withObject:(id)argument;</span></div>
<div class="O1"><span style="line-height:19px; color:rgb(255,0,0)">　- (id)initWithTarget:(id)target selector:(SEL)selector object:(id)argument;</span></div>
<div>
<div>•detachNewThreadSelector方法会直接启动线程方法</div>
<div>•initWithTarget需要调用start方法才能够启动线程方法</div>
</div>
<div>•参数说明：</div>
<div class="O1">　　–selector：线程执行的方法，只能有一个参数，不能有返回值</div>
<div class="O1">　　–target：selector消息发送的对象</div>
<div class="O1">　　–argument：传输给target的唯一参数，也可以是nil</div>
<div class="O1">&nbsp;</div>
<div class="O1">
<div>•NSOperation的两个子类</div>
<div class="O1">　　1.NSInvocationOperation</div>
<div class="O1">　　2.NSBlockOperation</div>
<div>•工作原理：</div>
<div class="O1">　　1.用NSOperation封装要执行的操作</div>
<div class="O1">　　2.将创建好的NSOperation对象放NSOperationQueue中</div>
<div class="O1">　　3.启动OperationQueue开始新的线程执行队列中的操作</div>
<div>•注意事项：</div>
<div class="O1">　　1.使用多线程时通常需要控制线程的并发数，因为线程会消耗系统资源，同时运行的线程过多，系统会变慢</div>
<div class="O1">　　2.使用以下方法可以控制并发的线程数量：</div>
<div class="O1"><span style="line-height:19px; color:rgb(255,0,0)">-(void)setMaxConcurrentOperationCount:(NSInteger)cnt;</span></div>
<div class="O1">&nbsp;</div>
<div class="O1"><span style="line-height:19px; color:rgb(255,0,0)">NSInvocation/NSBlockOperation演练</span></div>
<div class="O1"><span style="line-height:19px"><img src="http://images.cnitblog.com/blog/594870/201312/27213224-c704efb7ea8041059aafd52be616684e.png" alt="" style="border:0px"></span></div>
<div class="O1">&nbsp;</div>
<div class="O1">&nbsp;</div>
<div class="O1">通过<span style="line-height:19px; color:rgb(255,0,0)">addDependency</span>建立线程之间的联系 /&nbsp;限制线程数量</div>
<div class="O1"><img src="http://images.cnitblog.com/blog/594870/201312/27213341-b47c1ee80a6f44d880a002e9ec5e4398.png" alt="" style="border:0px"></div>
<div class="O1">
<div class="O1">
<div class="O1">
<div class="O1">
<div>•GCD队列：</div>
<div>
<div class="O1">　　–Grand Central Dispatch是由苹果开发的一个多核编程的解决方案。iOS4.0+才能使用，是替代NSThread， NSOperation的高效和强大的技术</div>
<div class="O1">　　–GCD是基于C语言的</div>
</div>
<div>
<div>GCD的优点：</div>
<div class="O1">　　–充分利用多核</div>
<div class="O1">　　–所有的多线程代码集中在一起，便于维护</div>
<div class="O1">　　–GCD中无需使用@autoreleasepool</div>
<div class="O1">　　-如果要顺序执行，可以使用dispatch_sync同步方法</div>
<div class="O1">　　-dispatch_async无法确定任务的执行顺序</div>
<div class="O1">&nbsp;</div>
</div>
<div class="O1">1.全局队列：所有添加到主队列中的任务都是并发执行的</div>
<div class="O1">
<div>　　•全局队列（可能会开启多条线程）</div>
<div>　　<span style="line-height:19px; color:rgb(255,0,0)">dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);</span></div>
</div>
<div class="O1">2.串行队列：所有添加到串行队列中的任务都是顺序执行的</div>
<div class="O1">
<div><span style="line-height:19px">　　•串行队列（只可能会开启一条线程）</span></div>
<div>　　<span style="line-height:19px; color:rgb(255,0,0)">dispatch_queue_t queue = dispatch_queue_create("myQueue", DISPATCH_QUEUE_SERIAL);</span></div>
</div>
<div class="O1">3.主队列：所有添加到主队列中的任务都是在主线程中执行的</div>
<div class="O1">
<div><span style="line-height:19px">　　•主队列</span></div>
<div>　<span style="line-height:19px; color:rgb(255,0,0)">　dispatch_get_main_queue();</span></div>
</div>
</div>
</div>
</div>
<p style="margin:10px auto">&nbsp;•异步操作</p>
<p style="margin:10px auto">&nbsp;　　–<span style="line-height:19px; color:rgb(255,0,0)">dispatch_async</span>&nbsp;在其他线程执行任务，会开启新的线程</p>
<p style="margin:10px auto">&nbsp;　　–异步方法无法确定任务的执行顺序&nbsp;</p>
<div>•同步操作</div>
<p style="margin:10px auto">&nbsp;　　–<span style="line-height:19px; color:rgb(255,0,0)">dispatch_sync</span>&nbsp;在当前在当前线程执行任务，不开启新的线程</p>
<div class="O1">　　–同步操作与队列无关</div>
<div class="O1">&nbsp;</div>
<div class="O1">　　–同步方法会依次执行，能够决定任务的执行顺序</div>
<div class="O1">&nbsp;</div>
<div class="O1">　　–更新界面UI时，最好使用同步方法</div>
<p style="margin:10px auto"><span style="line-height:19px">GCD</span>就是为了在<span style="line-height:19px">“</span>多核<span style="line-height:19px">”</span>上使用多线程技术</p>
<p style="margin:10px auto">&nbsp;&nbsp; &nbsp; 1&gt;&nbsp;<span style="line-height:19px">要使用</span>GCD<span style="line-height:19px">，所有的方法都是</span><span style="line-height:19px; color:rgb(255,0,0)">dispatch</span><span style="line-height:19px">开头的</span></p>
<p style="margin:10px auto">&nbsp;&nbsp; &nbsp; 2&gt;&nbsp;<span style="line-height:19px">名词解释</span></p>
<p style="margin:10px auto">&nbsp;&nbsp; &nbsp; global&nbsp;&nbsp;<span style="line-height:19px">全局</span></p>
<p style="margin:10px auto">&nbsp; &nbsp; &nbsp;queue &nbsp; 队列</p>
<p style="margin:10px auto">&nbsp; &nbsp; &nbsp;async &nbsp; 异步</p>
<p style="margin:10px auto">&nbsp;&nbsp; &nbsp; sync&nbsp; &nbsp;&nbsp;<span style="line-height:19px">同步</span>&nbsp;</p>
<p style="margin:10px auto"><span style="line-height:19px">&nbsp;&nbsp; &nbsp; 3&gt;&nbsp;</span>要执行异步的任务，就在全局队列中执行即可</p>
<p style="margin:10px auto">&nbsp;&nbsp; &nbsp; &nbsp;dispatch_async 异步执行控制不住先后顺序</p>
<p style="margin:10px auto">&nbsp;&nbsp; &nbsp; 4&gt;&nbsp;<span style="line-height:19px">关于</span>GCD<span style="line-height:19px">的队列</span></p>
<p style="margin:10px auto">&nbsp;&nbsp; &nbsp; &nbsp;全局队列&nbsp; &nbsp;&nbsp;<span style="line-height:19px; color:rgb(255,0,0)">dispatch_get_global_queue</span></p>
<p style="margin:10px auto">&nbsp;&nbsp; &nbsp;&nbsp;<span style="line-height:19px">参数：优先级</span>&nbsp;<span style="line-height:19px; color:rgb(255,0,0)">DISPATCH_QUEUE_PRIORITY_DEFAULT</span></p>
<p style="margin:10px auto">&nbsp;&nbsp; &nbsp;&nbsp;<span style="line-height:19px">始终是</span>&nbsp;0</p>
<p style="margin:10px auto">&nbsp;&nbsp; &nbsp;&nbsp;<span style="line-height:19px">串行队列</span>&nbsp; &nbsp;<span style="line-height:19px">&nbsp;<span style="color:rgb(255,0,0)">dispatch_queue_create("myQueue", DISPATCH_QUEUE_SERIAL);</span></span></p>
<p style="margin:10px auto"><span style="line-height:19px">&nbsp;&nbsp; &nbsp;&nbsp;</span>是创建得到的，不能直接获取</p>
<p style="margin:10px auto">&nbsp;&nbsp; &nbsp;&nbsp;<span style="line-height:19px">主队列</span>&nbsp; &nbsp; &nbsp;&nbsp;<span style="line-height:19px; color:rgb(255,0,0)">dispatch_get_main_queue</span></p>
<p style="margin:10px auto"><span style="line-height:19px">&nbsp; &nbsp; &nbsp;5&gt;&nbsp;</span>异步和同步与方法名无关，与运行所在的队列有关！</p>
<p style="margin:10px auto"><span style="line-height:19px">&nbsp;&nbsp; &nbsp;&nbsp;</span>提示：要熟悉队列于同步、异步的运行节奏，一定需要自己编写代码测试！同步主要用来控制方法的被调用的顺序</p>
<div class="O1">
<div class="O1">
<div class="O1">&nbsp;</div>
<div class="O1"><span style="line-height:19px"><img src="http://images.cnitblog.com/blog/594870/201312/27213509-11cf84778c934be3b2dc97de5857716a.png" alt="" style="border:0px; width:729px"></span></div>
</div>
</div>
</div>
<div class="O1">&nbsp;</div>
<div class="O1"><img src="http://images.cnitblog.com/blog/594870/201312/27213624-39262600d65e4221b659fd8415ca9343.png" alt="" style="border:0px; width:729px"></div>
<div class="O1">&nbsp;</div>
<div class="O1"><img src="http://images.cnitblog.com/blog/594870/201312/27213654-3b32def361854624b81e4284adc7425d.png" alt="" style="border:0px; width:729px"></div>
<div class="O1">&nbsp;</div>
<div class="O1"><span style="line-height:27px; color:rgb(255,0,0); font-size:18px"><strong>---------------------线程锁-------------------</strong></span></div>
<div class="O1">&nbsp;</div>
<div class="O1"><strong><img src="http://images.cnitblog.com/blog/594870/201312/27213735-3a13c6bf125540639d785eed470ec250.png" alt="" style="border:0px"></strong></div>
<div class="O1">&nbsp;</div>
<div class="O1">&nbsp;</div>
<div class="O1"><span style="line-height:27px; color:rgb(255,0,0); font-size:18px"><strong>---------------------通过NSBlockOperation内存缓存-------------------</strong></span></div>
<div class="O1">&nbsp;</div>
<div class="O1">&nbsp;</div>
<div class="O1"><img src="http://images.cnitblog.com/blog/594870/201312/27213833-0421fc535159469c9dbcb5e5c5cef379.png" alt="" style="border:0px; width:729px"></div>
<div class="O1">&nbsp;</div>
<div class="O1"><span style="line-height:27px; color:rgb(255,0,0); font-size:18px">---------------------内存管理-------------------</span></div>
<div class="O1">&nbsp;</div>
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