本篇文章介紹了IOS如何檢測指定路徑的文件是否存在，下面我們就來看看詳細的教程，需要的朋友可以參考下。
- (NSString *)dataPath:(NSString *)file?
{?
??? NSString *path = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"badge"];?
??? BOOL bo = [[NSFileManager defaultManager] createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];?
??? NSAssert(bo,@"創建目錄失敗");?
??? NSString *result = [path stringByAppendingPathComponent:file];?
??? return result;?
}??
- (void)viewDidLoad?
{?
??? [super viewDidLoad];??
??? //此處首先指定了圖片存取路徑（默認寫到應用程序沙盒 中）?
??? NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);?
??? //并給文件起個文件名?
??? NSString *imageDir = [[[paths objectAtIndex:0] stringByAppendingPathComponent:@"163"] stringByAppendingPathComponent:@"songzi"];?
??? //存放圖片的文件夾?
??? NSString *imagePath =[imageDir stringByAppendingPathComponent:@"文件名.png"];?
??? NSData *data = nil;?
??? //檢查圖片是否已經保存到本地?
??? if([self isExistsFile:imagePath]){?
??????? data=[NSData dataWithContentsOfFile:imagePath];?
??? }else{?
??????? data = [NSData dataWithContentsOfURL:[NSURL URLWithString: @"網址"]];?
??????? //創建文件夾路徑?
??????? [[NSFileManager defaultManager] createDirectoryAtPath:imageDir withIntermediateDirectories:YES attributes:nil error:nil];?
??????? //創建圖片?
??????? [UIImagePNGRepresentation([UIImage imageWithData:data]) writeToFile:imagePath atomically:YES];??????????
??? }?
??? imageView.image = [UIImage imageWithData:data];?
}?
?
檢查文件是否存在
?
NSString *path = [[NSBundle mainBundle] pathForResource:fileName ofType:@""];
if(path==NULL)
?
方法二：
?
NSFileManager *fileManager = [NSFileManager defaultManager];
?? //Get documents directory
?? NSArray *directoryPaths = NSSearchPathForDirectoriesInDomains
?? (NSDocumentDirectory, NSUserDomainMask, YES);
?? NSString *documentsDirectoryPath = [directoryPaths objectAtIndex:0];
?? if ([fileManager fileExistsAtPath:@""]==YES) {
??????? NSLog(@"File exists");
??? }??
?
方法三：
?
//判斷文件是否存在
??? if(![c judgeFileExist:@"user.plist"])??????
??? {
??????? NSLog(@"請確認該文件是否存在！");
??????? return;
??? }
?
方法四：
?
//判斷文件是否存在
-(BOOL)judgeFileExist:(NSString * )fileName
{
??? //獲取文件路徑
??? NSString *path = [[NSBundle mainBundle] pathForResource:fileName ofType:@""];
??? if(path==NULL)
??????? return NO;
??? returnYES;
}
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