iOS-应用间通信之自定义URL Schemes

一、URL Schemes知识的了解

URL Scheme是类似http://, ftp://这样的东西，同样你也可以为自己的应用自定URL Scheme，其他应用通过此标识就可以访问你的应用，如果自定的URL Scheme 和系统应用的相同，则会调用系统应用，而不会调用自定的应用程序。

例如：invoking://com.hello/yourpath/?username=WT&password=123456&callback=myapp

其中invoking是URL Scheme 即[url scheme]，com.hello是host,即[url host], yourpath是path,即[url path],username=WT&password=123456&callback=myapp是query,即[url query]。

二、调用自己开发的应用

１）在plist文件中，注册自定对外接口

CFBundleURLName(URL Identifier)　A string containing the abstract name of the URL scheme. To ensure uniqueness, it is recommended that you specify a reverse-DNS style of identifier, for example, com.acme.myscheme.The string you specify is also used as a key in your app’s InfoPlist.strings file. The value of the key is the human-readable scheme name.

CFBundleURLSchemes(URL Schemes) An array of strings containing the URL scheme names—for example, http, mailto, tel, and sms.

可以设置多个(URL Schemes)，设置成功后如下：

调用方的部分代码如下：

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    CGRect rectTextView= CGRectMake(10.0f, 30.0f, 300.0f, 100.0f);
    self.textView = [[UITextView alloc] initWithFrame:rectTextView];
    [self.textView.layer setBorderColor:[UIColor lightGrayColor].CGColor];
    [self.textView.layer setBorderWidth:0.5f];
    [self.textView setText:@"username=WT&password=123456&callback=invoking"];
    [self.view addSubview:self.textView];

    CGRect rect = CGRectMake(10.0f, 150.0f, 300.0f, 40.0f);
    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button.frame = rect;
    [button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    [button setTitle:@"Login" forState:UIControlStateNormal];
    [button setBackgroundColor:[UIColor blueColor]];
    [button addTarget:self action:@selector(handle:) forControlEvents:UIControlEventTouchUpInside];
    [button.layer setMasksToBounds:YES];
    [button.layer setCornerRadius:5.0f];
    [self.view addSubview:button];
}

- (void)handle:(id)sender
{

    NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:
@"invoked://com.hello/path?%@", self.textView.text]];
    if ([[UIApplication sharedApplication] canOpenURL:url]) {
        [[UIApplication sharedApplication] openURL:url];
    } else {
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"message"
message:[NSString stringWithFormat:@"%@", url]
delegate:self cancelButtonTitle:@"确定"
otherButtonTitles:nil, nil nil];
        [alertView show];
    }
}

被调用方的接收代码：

- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{
    NSLog(@"%@", url);
    if ([[url scheme] isEqualToString:@"invoked"]) {
        if ([[url host] isEqualToString:@"com.hello"]) {
            NSString *query = [url query];
            NSArray *array = [query componentsSeparatedByString:@"&"];

            NSMutableDictionary *dic = [NSMutableDictionary dictionaryWithCapacity:10];
            for (NSString *item in array) {
                NSArray *valueArray = [item componentsSeparatedByString:@"="];
                [dic setValue:[valueArray objectAtIndex:1] forKey:[valueArray objectAtIndex:0]];
            }
            [self application:application didFinishLaunchingWithOptions:dic];
        }
        return YES;
    }
    return NO;
}

同样，可以在传入参数中设置一些预留字段，以便以后扩展，要实现再能够回调回去，就可以加一个callback字段，如：callback=myapp 后面跟上自己应用的URL Scheme,再将执行完成的结果返回回去。代码处理和被调用方大致相同。