将账号密码用Plist文件保存在本地

      在IOS项目的开发中，登陆的时候需要输入账号密码，但是每次登陆如果老是要输入账号密码，用户会很烦躁的，所有为了考虑用户体验，我们会做一个记住账号密码的功能。其基本原理就是用户第一次输入账号密码之后，我们就把账号密码保存在本地，当然前提是这个账号密码是正确的，总体来说还是挺简单的，不如直接看代码吧。

#import <UIKit/UIKit.h>

@interface LoadViewController : UIViewController

@property (weak, nonatomic) IBOutlet UITextField *textAccount;
@property (weak, nonatomic) IBOutlet UITextField *textPassword;

@end

//把账号和密码写入plist
- (void)writeToPlist {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString * path = [paths objectAtIndex:0];
NSString *Files = @"Account";
NSFileManager * fm = [NSFileManager defaultManager];
NSString *filePath =[NSString stringWithFormat:@"%@/%@",path,Files];
if (![fm fileExistsAtPath:filePath]) {
[fm createDirectoryAtPath:filePath withIntermediateDirectories:YES attributes:nil error:nil];
}

NSString * docDir = [filePath stringByAppendingPathComponent:@"account.plist"];
NSMutableDictionary * loaddic = [NSMutableDictionary dictionaryWithObjectsAndKeys:self.textAccount.text,@"name",self.textPassword.text,@"password", nil];
[loaddic writeToFile:docDir atomically:YES];
}

//从plist文件中读取账号和密码
- (NSMutableDictionary *)readFromPlist {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString * path = [paths objectAtIndex:0];
NSString *Files = @"Account";
NSFileManager * fm = [NSFileManager defaultManager];
NSString *filePath =[NSString stringWithFormat:@"%@/%@",path,Files];
if (![fm fileExistsAtPath:filePath]) {
[fm createDirectoryAtPath:filePath withIntermediateDirectories:YES attributes:nil error:nil];
}
NSString * docDir = [filePath stringByAppendingPathComponent:@"account.plist"];
NSMutableDictionary *loaddic = [NSMutableDictionary dictionaryWithContentsOfFile:docDir];
NSString *name =[loaddic objectForKey:@"name"];
NSString *password =[loaddic objectForKey:@"password"];
self.textAccount.text = name;
self.textPassword.text = password;
return loaddic;
}

这个是最主要的代码，还有一些调用的方法，就自个儿去写吧。