我正在寻找一种更好的方法来检测iPhone/iPad设备上的可用/空闲磁盘空间。
目前,我正在使用NSFileManager来检测磁盘空间。下面是为我完成这项工作的代码片段:
-(unsigned)getFreeDiskspacePrivate {
NSDictionary *atDict = [[NSFileManager defaultManager] attributesOfFileSystemForPath:@"/" error:NULL];
unsigned freeSpace = [[atDict objectForKey:NSFileSystemFreeSize] unsignedIntValue];
NSLog(@"%s - Free Diskspace: %u bytes - %u MiB", __PRETTY_FUNCTION__, freeSpace, (freeSpace/1024)/1024);
return freeSpace;
}上面的代码片段是正确的吗?或者,是否有更好的方法来了解总的可用/可用磁盘空间。
我必须检测总的空闲磁盘空间,因为我们必须防止我们的应用程序在磁盘空间不足的情况下执行同步。
发布于 2011-11-07 20:34:23
更新:由于这个答案和新方法/API已经添加了很长时间,请检查下面针对Swift等的更新答案;因为我自己没有使用过它们,所以我不能保证。
原始答案:我发现以下解决方案对我有效:
-(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;
}它返回的大小与设备连接到机器时iTunes显示的大小完全相同。
发布于 2012-02-08 00:35:12
使用unsigned long long修改源代码:
- (uint64_t)freeDiskspace
{
uint64_t totalSpace = 0;
uint64_t totalFreeSpace = 0;
__autoreleasing 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 = %d", [error domain], [error code]);
}
return totalFreeSpace;
}编辑:似乎有人将此代码编辑为使用“uint64_t”而不是“unsigned long long”。虽然在可预见的未来,这应该是很好的,但它们是不一样的。'uint64_t‘是64位的,并且永远是64位的。10年后,“无符号long long”可能是128。这是一个小问题,但为什么我使用unsignedLongLong。
发布于 2015-04-03 00:32:39
我已经编写了一个使用Swift获取可用/已用内存的类。演示地址:https://github.com/thanhcuong1990/swift-disk-status
Swift 4已更新。
import UIKit
class DiskStatus {
//MARK: Formatter MB only
class func MBFormatter(_ bytes: Int64) -> String {
let formatter = ByteCountFormatter()
formatter.allowedUnits = ByteCountFormatter.Units.useMB
formatter.countStyle = ByteCountFormatter.CountStyle.decimal
formatter.includesUnit = false
return formatter.string(fromByteCount: bytes) as String
}
//MARK: Get String Value
class var totalDiskSpace:String {
get {
return ByteCountFormatter.string(fromByteCount: totalDiskSpaceInBytes, countStyle: ByteCountFormatter.CountStyle.file)
}
}
class var freeDiskSpace:String {
get {
return ByteCountFormatter.string(fromByteCount: freeDiskSpaceInBytes, countStyle: ByteCountFormatter.CountStyle.file)
}
}
class var usedDiskSpace:String {
get {
return ByteCountFormatter.string(fromByteCount: usedDiskSpaceInBytes, countStyle: ByteCountFormatter.CountStyle.file)
}
}
//MARK: Get raw value
class var totalDiskSpaceInBytes:Int64 {
get {
do {
let systemAttributes = try FileManager.default.attributesOfFileSystem(forPath: NSHomeDirectory() as String)
let space = (systemAttributes[FileAttributeKey.systemSize] as? NSNumber)?.int64Value
return space!
} catch {
return 0
}
}
}
class var freeDiskSpaceInBytes:Int64 {
get {
do {
let systemAttributes = try FileManager.default.attributesOfFileSystem(forPath: NSHomeDirectory() as String)
let freeSpace = (systemAttributes[FileAttributeKey.systemFreeSize] as? NSNumber)?.int64Value
return freeSpace!
} catch {
return 0
}
}
}
class var usedDiskSpaceInBytes:Int64 {
get {
let usedSpace = totalDiskSpaceInBytes - freeDiskSpaceInBytes
return usedSpace
}
}
}演示

https://stackoverflow.com/questions/5712527
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