计算文件大小

#import <Foundation/Foundation.h>

@interface NSString (CqGetFileSizeExtension)

//计算文件的大小
- (unsigned long long)cq_fileSize;

@end


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#import "NSString+CqGetFileSizeExtension.h"

@implementation NSString (CqGetFileSizeExtension)

//计算文件的大小
- (unsigned long long)cq_fileSize{
    //创建文件管理者
    NSFileManager *mgr = [NSFileManager defaultManager];
    //查看文件类型
    NSDictionary *atts = [mgr attributesOfItemAtPath:self error:nil];
    NSString *fileType = atts.fileType;
    
    if ([fileType isEqualToString:NSFileTypeDirectory]) {
        //获取文件夹遍历器
        NSDirectoryEnumerator *enumerator = [mgr enumeratorAtPath:self];
        
        //总大小
        unsigned long long fileSize = 0;
        
        //遍历所有子路径
        for (NSString *subpath in enumerator) {
            //获取子路径的全路径
            NSString *fullPath = [self stringByAppendingPathComponent:subpath];
            fileSize += [mgr attributesOfItemAtPath:fullPath error:nil].fileSize;
            
        }
        
        return fileSize;
    }
    
    //返回文件大小
    return atts.fileSize;
    
}