ios - 如何修复 Objective-C 中的内存泄漏？
<p><p>我构建了一个从 HockeyApp 获取报告的简单应用程序。但是，当我使用内存泄漏工具运行应用程序时，它显示当我执行 getReport 操作时存在内存泄漏。我无法理解仪器中显示的所有信息。</p>
<p>这是导致内存泄漏的按钮操作方法:</p>
<pre><code>- (IBAction)getReports:(id)sender {
//initialize url that is going to be fetched.
NSURL *url = ;
//initialize a request from url
NSMutableURLRequest *request = ;
;
;
;
//initialize a connection from request
NSURLConnection *connection = [ initWithRequest:request delegate:self];
self.getReportConnection = connection;
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData*)data{
if (connection==getReportConnection) {
;
NSLog(@"data is %@",data);
NSString *responseString = [ initWithData:data encoding:NSUTF8StringEncoding];
NSError *e = nil;
NSData *jsonData = ;
NSDictionary *JSON = ;
NSLog(@"login json is %@",JSON);
NSLog(@"reason json is %@",JSON[@"reason"]);
enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
];
NSLog(@"index = %lu, Object For title Key = %@", (unsigned long)idx, obj[@"reason"]);
}];
NSError *error = nil;
NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:jsonData
options:kNilOptions error:&error];
if (error != nil) {
NSLog(@"Error parsing JSON.");
}
else {
NSLog(@"Array: %@,array count is %d", jsonArray,jsonArray.count);
}
// ];
if (JSON!=NULL) {
UIAlertView *alert=[initWithTitle:@"Reports succesfully retrieved" message:@"" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles: nil];
;
}
}
}
// This method receives the error report in case of connection is not made to server.
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
UIAlertView *errorAlert=[initWithTitle:@"Wrong Login" message:nil delegate:self cancelButtonTitle:@"ok" otherButtonTitles: nil];
;
NSLog(@"error is %@",error);
}
// This method is used to process the data after connection has made successfully.
- (void)connectionDidFinishLoading:(NSURLConnection *)connection{
}
</code></pre>
<p>我发现内存泄漏发生在 <code>didRecieveData</code> 方法中出现警报 View 之前。</p>
<p>这里是内存泄漏工具显示内存泄漏的截图:</p>
<p> <img src="/image/No2CA.png" alt="enter image description here"/> </p>
<p>我不明白代码的哪一部分导致了内存泄漏。谁能告诉我如何使用泄漏工具识别导致内存泄漏的代码部分？</p>
<p><strong>编辑:</strong>当我在模拟器上运行应用程序时，仪器没有显示任何内存泄漏:</p>
<p>截图如下:
<img src="/image/Cr6ci.png" alt="enter image description here"/> </p>
<p>当我在设备上运行应用程序时，仪器再次显示内存泄漏:
<img src="/image/YfJVn.png" alt="enter image description here"/> </p>
<p>我查看了泄漏部分，发现 <code>NSmutableArray</code> 导致了泄漏:
<img src="/image/JozSl.png" alt="enter image description here"/>
<img src="/image/ngOwq.png" alt="enter image description here"/> </p>
<p>我在我的代码中只使用了一个 <code>NSMutableArray</code>。我在 <code>.h</code> 文件中声明了它:</p>
<pre><code>@property (nonatomic,strong) NSMutableArray *reportArray;
</code></pre>
<p>并在<code>viewDidLoad</code>中分配:</p>
<pre><code>reportArray=[init];
</code></pre>
<p>并将其加载到 <code>didRecieveData</code>:</p>
<pre><code> ];
</code></pre>
<p>堆栈跟踪快照:</p>
<p> <img src="/image/Tez4i.png" alt="enter image description here"/>
<img src="/image/iZAMK.png" alt="enter image description here"/>
<img src="/image/vzfz3.png" alt="enter image description here"/> </p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>试试这个:</p>
<pre><code>reportArray = [[ init] autorelease];
</code></pre>
<p>在您的 <code>connectionDidFinishLoading:</code> 和 <code>connection:didFailWithError:</code> 方法中设置</p>
<pre><code>reportArray = nil
</code></pre>
<p>最后在 <strong>Project > Build Phases > Compile Sources</strong> 添加 <code>-fno-objc-arc</code> 作为编译器标志<strong>此文件</strong> <em> (已编辑，抱歉)</em>。然后再次点击 Product menu >Analyze <em>(command + shift + B)</em>，查看是否还存在内存泄漏。</p></p>
<p style="font-size: 20px;">关于ios - 如何修复 Objective-C 中的内存泄漏？，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/31208743/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/31208743/
</a>
</p>
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