这是我在ViewController.m文件中的代码,
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
NSLog(@"%f",[self usedMemory]);
NSMutableArray *array= [[NSMutableArray alloc]init];
for (int i = 0; i < 100; i++) {
NSMutableData *data = [NSMutableData dataWithLength:10000];
[array addObject:data];
}
NSLog(@"%f",[self usedMemory]);
for (int i = 0; i < 100; i++) {
[array removeObjectAtIndex:0];
}
NSLog(@"%f",[self usedMemory]);
}
这是
usedMemory
方法:- (double)usedMemory
{
task_basic_info_data_t taskInfo;
mach_msg_type_number_t infoCount = TASK_BASIC_INFO_COUNT;
kern_return_t kernReturn = task_info(mach_task_self(),
TASK_BASIC_INFO,
(task_info_t)&taskInfo,
&infoCount);
if (kernReturn != KERN_SUCCESS
)
{
return NSNotFound;
}
return taskInfo.resident_size / 1024.0 / 1024.0;
}
结果如下:
2015-01-26 22:39:00.058 audio_memory_test[9050:874963] 25.011719
2015-01-26 22:39:00.060 audio_memory_test[9050:874963] 26.312500
2015-01-26 22:39:00.060 audio_memory_test[9050:874963] 26.312500
删除阵列中的对象时,为什么没有释放内存?
removeObjectAtIndex
方法做了什么?如何释放此记忆? 最佳答案
在最后一个循环之后调用[self usedMemory]
时,对象仍保留在内存中。它们所属的自动释放池尚未耗尽。当您离开源代码的范围并且系统再次控制时,通常会发生这种情况。