Question

Hi 我在我的项目中应用了这个对象“ 列表管理器” 来写/ 读列表。问题在于该列表会运行( 我希望), 当输入背景时( 我使用通知, NSlog ) 我仍然可以读取之前输入的数据。

点是当我停止 xcode 上的模拟并再次运行时, 列表现在是空的。为什么?

@interface ReadWritePlist : NSObject
+(void)writeToPlist:(NSString*)filePlist dic:(NSDictionary*)dic;
+ (NSMutableDictionary *)readPlist:(NSString*)filePlist;

@end

@implementation ReadWritePlist


+ (void)writeToPlist:(NSString*)filePlist dic:(NSDictionary*)dic
{

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];

    [dic writeToFile:[documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.plist",filePlist]] atomically:YES];

}


+ (NSMutableDictionary *)readPlist:(NSString*)filePlist {

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *filePath = [[documentsDirectory stringByAppendingPathComponent:filePlist] stringByAppendingPathExtension:@"plist"];
    NSMutableDictionary *dic=[[NSMutableDictionary alloc] initWithContentsOfFile:filePath];

    return dic;
}

< 坚固 > 解决 < / 坚固 >

我刚刚找到了这些新的读/写列表方法, 它正在起作用。我不得不在应用门( Finnish Launching with Options) 中添加“ 初始化FileDic ” 方法 :

@implementation PlistManager

+ (NSMutableDictionary *)readPlist:(NSString*)filePlist {

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [[documentsDirectory stringByAppendingPathComponent:filePlist] stringByAppendingPathExtension:@"plist"];
NSMutableDictionary *dic=[[NSMutableDictionary alloc] initWithContentsOfFile:filePath];

return dic;
}




+ (void)writeToPlist:(NSString*)filePlist dic:(NSDictionary*)dic
{

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];

    if ([dic writeToFile:[documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.plist",filePlist]] atomically:YES]) {
    NSLog(@"Ok done!");
    } 
    else{
            NSLog(@"Noo not done!");
    }
} 

+ (void)initializeFileDic:(NSString*)FileNameExt
{
    NSString *path = [[NSBundle mainBundle] bundlePath];
    NSString *startPath = [[path stringByAppendingPathComponent:FileNameExt]stringByAppendingPathExtension:@"plist"] ;
    NSString *documentsDirectoryPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString *filePath = [[documentsDirectoryPath stringByAppendingPathComponent:FileNameExt]stringByAppendingPathExtension:@"plist"];

    NSLog(@"%@ 
,
 %@ ",startPath,filePath);
    if([NSDictionary dictionaryWithContentsOfFile: startPath]){
    NSLog(@"File %@ exists",filePath);
    }
    if (![[NSFileManager defaultManager] fileExistsAtPath:filePath]){
        if([[NSDictionary dictionaryWithContentsOfFile:startPath] writeToFile:filePath atomically:NO])
        NSLog(@"File copied inside App DocumentsDirectory

");
    else
        NSLog(@"Error while trying to copy into DocumentsDirectory

"); 
    }

}


@end

Could Anybody explain what was wrong? Thanks

Answer 1

您何时拨打电话将数据保存到列表中? 如果您退出 Xcode 中的应用程序, 将会被立即终止, 并且不会通过任何与终止或进入背景有关的应用程序代表方法, 我怀疑您的代码所在。

按下模拟器上的主按钮是让这些方法运行的方法。

友情链接