復制代碼 代碼如下:
- (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
復制代碼 代碼如下:
NSString *path = [[NSBundle mainBundle] pathForResource:fileName ofType:@""];
if(path==NULL)
方法二：
復制代碼 代碼如下:
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：
復制代碼 代碼如下:
//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：
復制代碼 代碼如下:
//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;
}
