IOS代码获取内存大小

//存储内存

- (float)getFreeDiskspace{

    float totalSpace;

    float totalFreeSpace=0.f;

    NSError *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 floatValue]/1024.0f/1024.0f/1024.0f;

        totalFreeSpace = [freeFileSystemSizeInBytes floatValue]/1024.0f/1024.0f/1024.0f;

        NSLog(@"Memory Capacity of %f GB with %f GB Free memory available.", totalSpace, totalFreeSpace);

    } else {

        NSLog(@"Error Obtaining System Memory Info: Domain = %@, Code = %@", [error domain], [error code]);

    }

    return totalFreeSpace;

}

//可用运行内存

- (double)getAvailableBytes

{

    vm_statistics_data_t vmStats;

    mach_msg_type_number_t infoCount = HOST_VM_INFO_COUNT;

    kern_return_t kernReturn = host_statistics(mach_host_self(), HOST_VM_INFO, (host_info_t)&vmStats, &infoCount);

    if (kernReturn != KERN_SUCCESS)

    {

        return NSNotFound;

    }

    return (vm_page_size * vmStats.free_count) + (vmStats.inactive_count * vm_page_size);

}

- (double)getAvailableKiloBytes

{

    return [self getAvailableBytes] / 1024.0;

}

- (double)getAvailableMegaBytes

{

    return [self getAvailableKiloBytes] / 1024.0;

}

//-----------------------------------------------------

内存各种类型

原文网址http://www.cnblogs.com/bandy/archive/2012/08/15/2639742.html

BOOL memoryInfo(vm_statistics_data_t *vmStats) {
    mach_msg_type_number_t infoCount = HOST_VM_INFO_COUNT;
    kern_return_t kernReturn = host_statistics(mach_host_self(), HOST_VM_INFO, (host_info_t)vmStats, &infoCount);
    
    return kernReturn == KERN_SUCCESS;
}

void logMemoryInfo() {
    vm_statistics_data_t vmStats;
    
    if (memoryInfo(&vmStats)) {
        NSLog(@"free: %u\nactive: %u\ninactive: %u\nwire: %u\nzero fill: %u\nreactivations: %u\npageins: %u\npageouts: %u\nfaults: %u\ncow_faults: %u\nlookups: %u\nhits: %u",
            vmStats.free_count * vm_page_size,
            vmStats.active_count * vm_page_size,
            vmStats.inactive_count * vm_page_size,
            vmStats.wire_count * vm_page_size,
            vmStats.zero_fill_count * vm_page_size,
            vmStats.reactivations * vm_page_size,
            vmStats.pageins * vm_page_size,
            vmStats.pageouts * vm_page_size,
            vmStats.faults,
            vmStats.cow_faults,
            vmStats.lookups,
            vmStats.hits
        );
    }
}