用自己的App打開其他App不支持的文件如下效果圖：

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上圖用到的界面用到的類是 UIDocumentInteractionController

iOS添加支持打開的文件類型步驟兩種方式為1、2如下圖

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在自己App中獲取文件

如下代碼：

- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{
    NSLog(@"url = %@",url);
    if (url != nil) {
        NSString *path = [url absoluteString];
        path = [self URLDecodedString:path];
        NSMutableString *string = [[NSMutableString alloc] initWithString:path];
        if ([path hasPrefix:@"file://"]) {
            [string replaceOccurrencesOfString:@"file://" withString:@"" options:NSCaseInsensitiveSearch  range:NSMakeRange(0, path.length)];
        }
        
        //獲取在存儲(chǔ)在本地的文件路徑就可以在自己需要顯示的頁面加載文件顯示了
    }
    
    return YES;
}
//當(dāng)文件名為中文是，解決url編碼問題
-(NSString *)URLDecodedString:(NSString *)str
{
    NSString *decodedString=(__bridge_transfer NSString *)CFURLCreateStringByReplacingPercentEscapesUsingEncoding(NULL, (__bridge CFStringRef)str, CFSTR(""), CFStringConvertNSStringEncodingToEncoding(NSUTF8StringEncoding));
    NSLog(@"decodedString = %@",decodedString);
    return decodedString;
}

官方文檔地地址及部分截圖

https://developer.apple.com/library/content/documentation/Miscellaneous/Reference/UTIRef/Articles/System-DeclaredUniformTypeIdentifiers.html#//apple_ref/doc/uid/TP40009259-SW1

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