iOSで空きメモリの量を知るにはどうすればよいですか？

Question

iOSで空きメモリの量を確認するにはどうすればよいですか？

Answer 1

- (uint64_t)getFreeDiskspace 
{ 
uint64_t totalSpace = 0; 
uint64_t totalFreeSpace = 0; 

__autoreleasing error = nil; 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSDictionary *dictionary = [[NSFileManager defaultManager] attributesOfFileSystemForPath:[paths lastObject] error: &error]; 

if (dictionary) { 
    NSNumber *fileSystemSizeInBytes = [dictionary objectForKey: NSFileSystemSize]; 
    NSNumber *freeFileSystemSizeInBytes = [dictionary objectForKey:NSFileSystemFreeSize]; 
    totalSpace = [fileSystemSizeInBytes unsignedLongLongValue]; 
    totalFreeSpace = [freeFileSystemSizeInBytes unsignedLongLongValue]; 
    NSLog(@"Memory Capacity of %llu MiB with %llu MiB Free memory available.", ((totalSpace/1024ll)/1024ll), ((totalFreeSpace/1024ll)/1024ll)); 
} else { 
    NSLog(@"Error Obtaining System Memory Info: Domain = %@, Code = %d", [error domain], [error code]); 
} 

return totalFreeSpace; 
} 

これは

Answer 2

使用このコード：

natural_t freeMemory(void) { 
    mach_port_t   host_port = mach_host_self(); 
    mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t)/sizeof(integer_t); 
    vm_size_t    pagesize; 
    vm_statistics_data_t  vm_stat; 

    host_page_size(host_port, &pagesize); 

    if (host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size) != KERN_SUCCESS) NSLog(@"Failed to fetch vm statistics"); 

    natural_t mem_used = (vm_stat.active_count + vm_stat.inactive_count + vm_stat.wire_count) * pagesize; 
    natural_t mem_free = vm_stat.free_count * pagesize; 
    natural_t mem_total = mem_used + mem_free; 

    return mem_free; 
} 

私はこのコードのためにクレジットを主張していませんよ。私はhereからそれを得た。

希望すると便利です。