iOS 获取内存大小使用情况(进度条显示)
一、获取设备内存大小方法
//返回存储内存占用比例 - (NSString *)getFreeDiskspaceRate{ 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; //totalString、freeString是定义两个全局变量 进度条上显示大小数据用 totalString = [self getFileSizeString:[fileSystemSizeInBytes floatValue]]; freeString = [self getFileSizeString:[freeFileSystemSizeInBytes floatValue]]; NSLog(@"打印totalString:%@,freeString:%@",totalString,freeString); NSLog(@"Memory Capacity of %.2f GB with %.2f GB Free memory available.", totalSpace, totalFreeSpace); } else { NSLog(@"Error Obtaining System Memory Info: Domain = %@, Code = %@", [error domain], [error code]); } NSString *freeStr = [NSString stringWithFormat:@"%.3f",(totalSpace-totalFreeSpace)/totalSpace];//进度条比例 return freeStr; }
//补充:另一种获取内存大小的方法
首先导入#include <sys/param.h>和#include <sys/mount.h>
方法:
NSFileManager *fm = [NSFileManager defaultManager]; NSDictionary *fat = [fm attributesOfFileSystemForPath:NSHomeDirectory() error:nil]; NSLog(@"容量:%lldG 可用容量:%lldG",[[fat objectForKey:NSFileSystemSize]longLongValue]/1000000000,[[fat objectForKey:NSFileSystemFreeSize]longLongValue]/1000000000); struct statfs buf; long long freespace = -1; if(statfs("/var", &buf) >= 0){ freespace = (long long)(buf.f_bsize * buf.f_bfree); } NSLog(@"%@",[NSString stringWithFormat:@"手机剩余存储空间为:%qi GB" ,freespace/1024/1024/1024]);
二、转换内存大小为单位数值的方法(根据实际情况得到G、M、KB单位)
-(NSString *)getFileSizeString:(CGFloat)size { if (size>1024*1024*1024){ return [NSString stringWithFormat:@"%.1fG",size/1024/1024/1024];//大于1G,则转化成G单位的字符串 } else if(size<1024*1024*1024&&size>=1024*1024)//大于1M,则转化成M单位的字符串 { return [NSString stringWithFormat:@"%.1fM",size/1024/1024]; } else if(size>=1024&&size<1024*1024) //不到1M,但是超过了1KB,则转化成KB单位 { return [NSString stringWithFormat:@"%.1fK",size/1024]; } else//剩下的都是小于1K的,则转化成B单位 { return [NSString stringWithFormat:@"%.1fB",size]; } }
三、虚拟机上的效果图(这里截图显示的空间大小数值比较大,说明实际是电脑的内存情况,真机上显示就正常了)
四、其他
参考网址:http://www.bubuko.com/infodetail-922638.html