我创建了一个有助于在NSString数组中查找重复文件的函数（数组包含文件路径）
这是我的功能：
-(NSMutableArray *)compareWithList:(NSMutableArray*)fileCompareList // list of file from which we need to find the duplicates of the target
fileData:(NSData*)_fileData // contains target file data bytes
fileLength:(UInt32) _fileLenght // contains size of target file
{
// result list of the (duplcate)files
NSMutableArray* fileList = [[NSMutableArray alloc]init];
// flag to check if the path is a folder
BOOL isDir;
//stores the size of the file that is being itrated
UInt32 size = 0;
//stores the byte data of the file that is being itrated
NSData *bytes = nil;
//itrating the files in the list one by one in order find the duplicate
for (NSString* sPath in fileCompareList) {
//checking if the file already exists in the result list
if ([fileList indexOfObject:sPath] == NSNotFound)
{
//getting the size of the file
UInt32 size = [sysHelp getSizeOfFile:sPath];
//if the size matches of the target file and the itrated file then go inside
if(size == _fileLenght)
{
//get the bytes of the file being itrated
bytes = [[NSData alloc] initWithContentsOfFile:sPath];
//if the bytes matches then add the itrated file into the result list
if([bytes isEqualToData:_fileData])
{
[fileList addObject:sPath];
}
//remove the itrated file data from the array
bytes = nil;
}
}
}
return fileList;
}
这里的问题是，由于该功能，内存使用率越来越高，如下图所示：
之前
后
一段时间后
注意;我正在使用ARC
我怎么称呼功能？这里是：
NSMutableArray* allFilesOfSystem =[[NSMutableArray alloc] init];
allFilesOfSystem = self AllFilesOfDesktopAndSubDirectores];
NSMutableArray* FinalResultArray = [[NSMutableArray alloc] init];
for (int i = 0; i < [allFilesOfSystem count]; i++) {
NSString* filePath = [allFilesOfSystem objectAtIndex:i];
//file to byte array
NSData *bytes = [[NSData alloc] initWithContentsOfFile:filePath];
//file size
UInt32 size = [sysHelp getSizeOfFile:filePath];
[FinalResultArray addObjectsFromArray:[self compareWithList:allFilesOfSystem fileData:bytes fileLength:size]]
}
最佳答案
请在@ autoreleasepool中移动所有语句，如果有帮助请告诉我。下面是代码
-(NSMutableArray *)compareWithList:(NSMutableArray*)fileCompareList // list of file from which we need to find the duplicates of the target
fileData:(NSData*)_fileData // contains target file data bytes
fileLength:(UInt32) _fileLenght // contains size of target file
{
// result list of the (duplcate)files
NSMutableArray* fileList = [[NSMutableArray alloc] init];
@autoreleasepool {
// flag to check if the path is a folder
BOOL isDir;
//stores the size of the file that is being itrated
UInt32 size = 0;
//stores the byte data of the file that is being itrated
NSData *bytes = nil;
//itrating the files in the list one by one in order find the duplicate
for (NSString* sPath in fileCompareList) {
//checking if the file already exists in the result list
if ([fileList indexOfObject:sPath] == NSNotFound)
{
//getting the size of the file
UInt32 size = [sysHelp getSizeOfFile:sPath];
//if the size matches of the target file and the itrated file then go inside
if(size == _fileLenght)
{
//get the bytes of the file being itrated
bytes = [[NSData alloc] initWithContentsOfFile:sPath];
//if the bytes matches then add the itrated file into the result list
if([bytes isEqualToData:_fileData])
{
[fileList addObject:sPath];
}
//remove the itrated file data from the array
bytes = nil;
}
}
}
}
return fileList;
}
编辑：说明
放弃对象的所有权有两种方法。一个是发布，另一个是自动发布。如果您对某个对象调用release，并且该对象的保留计数变为立即释放，但是如果您自动释放对象，则一旦释放/耗尽了自动释放池即延迟释放，就会发送释放消息。让我们举个例子。
- (void)testMemoryInARC1 {
NSData *data = [[NSData alloc] initWithContentsOfFile:@"myfile.mp3"]; // reatin count is 1
//used this data an after few statements
//statement 1
// ..
//at the end of data varibale scope in this case it's the end of method
//ARC will insert the release call
// [data rlease]; //wchich releases the memory
}
- (void)testMemoryInARC2 {
NSData *data = [NSData dataWithContentsOfFile:@"myfile.mp3"]; // this method returns the autorelase object
//used this data an after few statements
//statement 1
// ..
//at the end of data varibale scope in this case it's the end of method
//ARC will NOT insert the release call since that was autoreleased object
//hence no release call
}
那么问题来了，它将何时发布？
ARS说：“很好的问题，当自动发布池结束（发布）时，它将发布”。
自动发布池何时会结束？
ARC说：“只要检查您在哪里创建了自动释放池，如果尚未创建，那么
main.m文件中会有一个主要的自动释放池”这意味着当main方法完成时，所有的autorelease对象都会被释放，这对程序的结尾有什么帮助？
ARC说：“再好的一个问题！可可库在整个开发过程中都使用了自动释放池，如果您还没有使用过它，那是您的问题，而不是我的。”
About Memory Management
关于objective-c - 应用程序未释放内存，每次使用的内存都增加了一倍，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/32818809/