如何检测iPhone/iPad设备上的总可用/空闲磁盘空间？
如何检测iPhone/iPad设备上的总可用/空闲磁盘空间？
提问于 2011-04-19 14:38:28
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。
回答 11
Stack Overflow用户
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。
Stack Overflow用户
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
Stack Overflow用户
发布于 2013-11-08 13:58:39
如果您需要带大小的格式化字符串，可以查看nice library on GitHub
#define MB (1024*1024)
#define GB (MB*1024)
@implementation ALDisk
#pragma mark - Formatter
+ (NSString *)memoryFormatter:(long long)diskSpace {
NSString *formatted;
double bytes = 1.0 * diskSpace;
double megabytes = bytes / MB;
double gigabytes = bytes / GB;
if (gigabytes >= 1.0)
formatted = [NSString stringWithFormat:@"%.2f GB", gigabytes];
else if (megabytes >= 1.0)
formatted = [NSString stringWithFormat:@"%.2f MB", megabytes];
else
formatted = [NSString stringWithFormat:@"%.2f bytes", bytes];
return formatted;
}
#pragma mark - Methods
+ (NSString *)totalDiskSpace {
long long space = [[[[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:nil] objectForKey:NSFileSystemSize] longLongValue];
return [self memoryFormatter:space];
}
+ (NSString *)freeDiskSpace {
long long freeSpace = [[[[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:nil] objectForKey:NSFileSystemFreeSize] longLongValue];
return [self memoryFormatter:freeSpace];
}
+ (NSString *)usedDiskSpace {
return [self memoryFormatter:[self usedDiskSpaceInBytes]];
}
+ (CGFloat)totalDiskSpaceInBytes {
long long space = [[[[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:nil] objectForKey:NSFileSystemSize] longLongValue];
return space;
}
+ (CGFloat)freeDiskSpaceInBytes {
long long freeSpace = [[[[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:nil] objectForKey:NSFileSystemFreeSize] longLongValue];
return freeSpace;
}
+ (CGFloat)usedDiskSpaceInBytes {
long long usedSpace = [self totalDiskSpaceInBytes] - [self freeDiskSpaceInBytes];
return usedSpace;
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/5712527
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