Question

我尝试在目标C中检查iOS 9及更高版本上的可用空间。对于iOS 11来说很简单：NSURLVolumeAvailableCapacityForImportantUsageKey 它工作正常！我有26GB。

但是对于iOS 9/10，我不知道该怎么做。我尝试使用此功能：

    //Get free space on the mobile
-(uint64_t)getFreeDiskspace {
    uint64_t totalSpace = 0;
    uint64_t totalFreeSpace = 0;
    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 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 = %ld", [error domain], (long)[error code]);
    }

    return totalFreeSpace;
}

但是结果是错误的，我在同一台设备上获得了18GB。

你有什么主意吗？

谢谢：）

Answer 1

对于iOS> = 6.0，可以使用新的NSByteCountFormatter。这段代码获取剩余的可用字节数作为格式化字符串。

NSError *error = nil;
NSArray * const paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, 
NSUserDomainMask, YES);
NSDictionary * const pathAttributes = [[NSFileManager defaultManager] 
attributesOfFileSystemForPath:[paths firstObject] error:&error];
NSAssert(pathAttributes, @"");
NSNumber * const fileSystemSizeInBytes = [pathAttributes objectForKey: 
NSFileSystemFreeSize];
const long long numberOfBytesRemaining = [fileSystemSizeInBytes longLongValue];
NSByteCountFormatter *byteCountFormatter = [[NSByteCountFormatter alloc] init];
NSString *formattedNmberOfBytesRemaining = [byteCountFormatter 
stringFromByteCount:numberOfBytesRemaining];

iOS 9/10->如何检查可用空间/可用空间

1 个答案: