iOS词典导致内存泄漏

Question

为什么下面的Dictionary实现会导致内存泄漏？请参阅下面的屏幕截图。实际上所有的泄漏都来自这种方法。

- (void) setLocation:(NSString *) location:(NSString *) turnPage {
    NSLog(@"Start setLocation");
    //---get the path to the property list file---
    NSString *localPlistFileNameConf = [[self documentsPath] stringByAppendingPathComponent:@"Config.plist"];
    NSMutableDictionary *copyOfDict;
    //---if the property list file can be found---
    if ([[NSFileManager defaultManager] fileExistsAtPath:localPlistFileNameConf]) {
        //---load the content of the property list file into a NSDictionary object---
        NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:localPlistFileNameConf];
        //---make a mutable copy of the dictionary object---
        copyOfDict = [dict mutableCopy];
        [dict release];
    }
    else {
        //---load the property list from the Resources folder---
        NSString *pListPath = [[NSBundle mainBundle] pathForResource:@"Config" ofType:@"plist"];
        NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:pListPath];
        //---make a mutable copy of the dictionary object---
        copyOfDict = [dict mutableCopy];
        [dict release];
    }
    location = [self checkLocationValidity:location:turnPage];
    [copyOfDict setValue:location forKey:@"Location"];
    [self writeConfigToFile:copyOfDict];
    NSLog(@"End setLocation");
}

Answer 1

您不会在任何地方发布copyOfDict。您拥有使用以copy开头的方法创建的任何对象，因此您需要释放这些对象。由于效率原因NSDictionary类集群中的一些技巧，它可能会错误地将源误报为原始字典。尝试对代码运行分析，它应该指出这些事情。