Objective-c自学笔记(3)-数据集合的使用

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按书上的例子敲了敲：

#import <Foundation/Foundation.h>int main(int argc,const char *argv[]){    @autoreleasepool {        //声明文件管理对象        NSFileManager *manager;        //由defaultManager方法创建NSFileManager初始化        manager = [NSFileManager defaultManager];        //声明要遍历路径        NSString *home;        //初始化要遍历的目录:用户根目录        home = [@"~" stringByExpandingTildeInPath];        //声明文件遍历对象        NSDirectoryEnumerator *direnum;        //初始化文件遍历对象,用文件目录对象home作参        direnum = [manager enumeratorAtPath:home];        //可变列表来保存遍历的文件        NSMutableArray *files;        //初始化大小设置为42        files = [NSMutableArray arrayWithCapacity:42];        //枚举迭代的对象        NSString *filename;        //使用迭代对象的方法来逐个遍历枚举中的所有元素        while(filename =[direnum nextObject]){            //判断文件是否是jpg格式的文件            if([[filename pathExtension] isEqualTo:@"jpg"]){                //将文件名添加到列表中                [files addObject:filename];            }        }        //声明文件列表枚举        NSEnumerator *fileenum;        //初始化枚举对象        fileenum = [files objectEnumerator];        //枚举遍历所有元素        while (filename=[fileenum nextObject]) {            //打印信息            NSLog(@"%@",filename);        }    };//autoreleasepool    return 0;}//main

输出

2015-01-27 23:00:11.181 04.01 Shapes-Inheritance[449:9009] Desktop/psb.jpg2015-01-27 23:00:11.194 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/QPR/15.jpg2015-01-27 23:00:11.194 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/QPR/19.jpg2015-01-27 23:00:11.194 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/QPR/22.jpg2015-01-27 23:00:11.195 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/QPR/24.jpg2015-01-27 23:00:11.195 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/QPR/4.jpg2015-01-27 23:00:11.195 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/QPR/QPR.numbers/preview-micro.jpg2015-01-27 23:00:11.195 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/QPR/QPR.numbers/preview-web.jpg2015-01-27 23:00:11.196 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/QPR/QPR.numbers/preview.jpg2015-01-27 23:00:11.196 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/伯恩利/11.jpg2015-01-27 23:00:11.196 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/伯恩利/21.jpg2015-01-27 23:00:11.196 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/伯恩利/7.jpg2015-01-27 23:00:11.215 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/伯恩利/Burnley.numbers/preview-micro.jpg2015-01-27 23:00:11.215 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/伯恩利/Burnley.numbers/preview-web.jpg2015-01-27 23:00:11.215 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/伯恩利/Burnley.numbers/preview.jpg2015-01-27 23:00:11.216 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/切尔西/10.jpg2015-01-27 23:00:11.216 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/切尔西/14.jpg2015-01-27 23:00:11.216 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/切尔西/19.jpg2015-01-27 23:00:11.217 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/切尔西/2.jpg2015-01-27 23:00:11.217 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/切尔西/21.jpg2015-01-27 23:00:11.217 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/切尔西/4.jpg2015-01-27 23:00:11.218 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/切尔西/7.jpg2015-01-27 23:00:11.218 04.01 Shapes-Inheritance[449:9009] Documents/aodci/球员信息/切尔西/chelsea.numbers/preview-micro.jpg

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