1、获取设备类型  （Iphone/ipad 几？）

 #import "sys/utsname.h"

-(NSString*)getDeviceVersion

{

    struct utsname systemInfo;

    uname(&systemInfo);

    NSString *deviceString = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];

    return deviceString;

}

2、获取系统时间

    NSDate* date = [NSDate date]; 

    NSDateFormatter* formatter = [[[NSDateFormatter alloc] init] autorelease];

    [formatter setDateFormat:@"yyyy-MM-dd HH:MM:SS"];

    [formatter stringFromDate:date];

3、获取应用版本 手机系统版本信息

    UIDevice* uiDevice = [UIDevice currentDevice]; 

    NSBundle* nsBundle = [NSBundle mainBundle];

    NSDictionary *infoDictionary = [nsBundle infoDictionary];

    NSString* crashInfo = [NSString stringWithFormat:@"Identifier:%@\nVersion:%@\nOS Version:%@     %@\nDate/Time:%@\nHardware Model:%@",

                        [nsBundle bundleIdentifier],

                        [infoDictionary objectForKey:@"CFBundleVersion"],

                        [uiDevice systemName],

                        [uiDevice systemVersion],

                        [self GetOnlyTime],

                        [self deviceString] ];

4、获取应用程序目录

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);

    NSString *cacheDir = [paths objectAtIndex: 0];

5、创建应用程序内部文件夹

       NSFileManager *fm = [NSFileManager defaultManager];

        NSDictionary *attributes = [NSDictionary dictionaryWithObject: [NSNumber numberWithUnsignedLong: 0755] forKey: NSFilePosixPermissions];

        if(![fm fileExistsAtPath:"文件路径"]){

            

            [fm createDirectoryAtPath:"文件路径"withIntermediateDirectories:YES attributes:attributes error:NULL];

        }

6、获取某个文件夹下所有文件 及删除以某后缀名结尾文件

    NSFileManager *fm = [NSFileManager defaultManager];

    NSArray *contents = [fm contentsOfDirectoryAtPath:path error:NULL];

    NSEnumerator *e = [contents objectEnumerator];

    NSString *filename;

    while ((filename = [e nextObject])) {

        NSLog(@"file Name = %@",filename);

        if ([[filename pathExtension] isEqualToString:@"txt"]||[[filename pathExtension] isEqualToString:@"plcrash"]) {

           [path stringByAppendingPathComponent:filename];

        }

    }