将字符串 数组 字典写入本地文件,并计算文件的大小,最后删除文件

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
//首先封装一个函数,使得这个函数返回的是我们在指定目录下想要的文件夹的路径
//创建了一个Imgs文件夹
NSString *imgsTmpPath = [self creatDirInTmp:@"Imgs"];

NSLog(@"imgsTmpPath = %@",imgsTmpPath);

//将字符串写入本地文件
NSString *targetString = @"Hello guys";
BOOL flag = [targetString writeToFile:[imgsTmpPath stringByAppendingPathComponent:@"a.txt"] atomically:YES encoding:NSUTF8StringEncoding error:nil];
if (flag)
{
NSLog(@"字符串写入成功");
}
else
{
NSLog(@"字符串写入失败");
}
//将数组写入本地文件
NSArray *array = @[@"张国荣",@"Beyond",@"张学友",@"陈奕迅",@"信乐团"];
BOOL flag1 = [array writeToFile:[imgsTmpPath stringByAppendingPathComponent:@"arrary.txt"] atomically:YES];
if (flag1)
{
NSLog(@"数组写入成功");
}
else
{
NSLog(@"数组写入失败");
}
//将字典写入本地
NSDictionary *dictionary = @{@"name":@"Rick",@"age":@"25",@"address":@"Gz"};
BOOL flag2 = [dictionary writeToFile:[imgsTmpPath stringByAppendingPathComponent:@"dictionary.txt"] atomically:YES];
if (flag2)
{
NSLog(@"字典写入本地成功");
}
else
{
NSLog(@"字典写入本地失败");
}
//计算文件大小
//获得将要计算的文件夹
NSFileManager *fileManager = [NSFileManager defaultManager];
//获得imgs目录下文件名组成的数组
NSArray *imgsFileArray = [fileManager subpathsAtPath:imgsTmpPath];
NSLog(@"imgsFileArray = %@",imgsFileArray);
/*打印结果:
imgsFileArray = (
"a.txt",
"arrary.txt",
"dictionary.txt"
*/
//遍历数组
CGFloat count = 0;
for (NSString *ele in imgsFileArray)
{
NSData *data = [NSData dataWithContentsOfFile:[imgsTmpPath stringByAppendingPathComponent:ele]];
count += data.length;
}
count = count/1024/1024;//将字节转化成M.
NSLog(@"缓存文件的大小为:%.2fM",count);
//删除文件
for (NSString *ele in imgsFileArray)
{
BOOL isSuccess = [fileManager removeItemAtPath:[imgsTmpPath stringByAppendingPathComponent:ele] error:nil];
if (isSuccess)
{
NSLog(@"删除成功");
}
else
{
NSLog(@"删除失败");
}

}

}
//这里我们封装一个函数,使得这个函数返回的是我们在tmp目录下想要的文件夹的路径
-(NSString *)creatDirInTmp:(NSString *)dirName
{
//获取根目录文件
NSString *tmp = NSTemporaryDirectory();

NSString *dirPath = [tmp stringByAppendingPathComponent:dirName];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
if (![fileManager fileExistsAtPath:dirPath])
{
BOOL isSuccess = [fileManager createDirectoryAtPath:dirPath withIntermediateDirectories:YES attributes:nil error:&error];
if (!isSuccess)
{
dirPath = nil;
NSLog(@"error = %@",error.debugDescription);
}
}
return dirPath;
}