iOS获取沙盒路径并写入文件

.h文件中

//你需要的数据集合形式
@property(nonatomic,strong)NSMutableArray *groupArray;//数组
@property(nonatomic,strong)NSMutableDictionary *allDict;//字典

//判断沙盒里面是否有需要的对象
+(ShareDataHandleModel*)shareDataHandleModel;

//获取沙盒文件中document路径
+(NSString*)documentPath;

//通过文件名从沙盒读数据
-(void)readDataFromDocumentWithFileName:(NSString*)fileName;//数组

-(void)readDataFromDocumentWithFileNameToDict:(NSString *)fileName;//字典

//写入
-(void)myWirteTofile:(NSString*)fileName;

.m文件中

+(ShareDataHandleModel*)shareDataHandleModel
{
   //如果为空 创建一个新的
    if (nil==shareModel) {
                shareModel=[[ShareDataHandleModel alloc]init];
    }
    return shareModel;
}

//获取沙盒文件中document路径
+(NSString*)documentPath
{
    NSArray *pathArray=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    return pathArray[0];
}

//通过文件名从沙盒读数据(数组)
-(void)readDataFromDocumentWithFileName:(NSString*)fileName
{
    //拼接文件路径
    NSString *filePath=[[[self class]documentPath]stringByAppendingFormat:@"/%@",fileName];
    
    NSArray *tempArray=[NSArray arrayWithContentsOfFile:filePath];
    
    self.groupArray=[NSMutableArray arrayWithObject:tempArray];

}

//通过文件名从沙盒读数据(字典)
-(void)readDataFromDocumentWithFileNameToDict:(NSString *)fileName
{
    //拼接文件路径
    // NSString *filePath=[[[self class]documentPath]stringByAppendingFormat:@"/%@",fileName];
    
    NSString *filePath=[self appendPath:fileName];//使用下面封装好的
    self.allDict=[NSMutableDictionary dictionaryWithContentsOfFile:filePath];
}

//封装
-(NSString*)appendPath:(NSString*)fileName
{

//拼接文件路径
    return [[[self class]documentPath]stringByAppendingFormat:@"/%@",fileName];

}

//写入
-(void)myWirteTofile:(NSString*)fileName
{
    NSString *filePath=[self appendPath:fileName];
    
    NSMutableArray *a=self.groupArray[0];
    [a writeToFile:filePath atomically:YES];

}