iphone - iOS 上 PayPal 的 MPL 库的初始化实际上是一个阻塞过程吗？

Question

适用于 iOS 的 PayPal 移动支付库的文档 here 指出您有两个选项来初始化库。 选项 1 是:

"Initialize the PayPal object on the main thread, when you need it. Initialize the library each time before you call the getPayButtonWithTarget method. This implementation is simple because it uses a single-threaded programming model. The initializeWithAppID call is blocking, so your application waits for the initialization to complete.
To use this method, you can use one line of code: [PayPal initializeWithAppID:appID];"

但是，每当我在主线程上调用此函数时，我都会返回 STATUS_INPROGRESS。我别无选择，只能手动休眠，直到状态变为 STATUS_COMPLETED_SUCCESS。

什么给了？

Answer 1

你可以打电话
[PayPal initializeWithAppID:appID] 在ViewController 的主线程中，但您必须等待2-3 秒用于Paypal 在点击按钮进行支付之前初始化信息。 (如果你使用这个例子
[[PayPal getPayPalInst] getPayButtonWithTarget:self...]; 您将看到按钮最初被禁用，仅在 1-2 秒后启用(变为黄色)。 如果你想调用
- (IBAction)simplePayment{} 来自主线程，您必须创建后台线程。 类似主题:iPhone PayPal init failed

-(void) viewDidAppear:(BOOL)animated {
   [super viewDidAppear:animated];
    [PayPal initializeWithAppID:@"APP-80W284485P519543T" forEnvironment:ENV_SANDBOX];
    [NSThread detachNewThreadSelector:@selector(checkInitStatusAndPay) toTarget:self withObject:nil];
}

-(void) checkInitStatusAndPay {


    while (TRUE) {
        PayPalInitializationStatus status = [PayPal initializationStatus];
        NSLog(@"status %u", status);
        if(status == STATUS_COMPLETED_SUCCESS) {

            [self performSelectorOnMainThread:@selector(simplePayment:) withObject:nil waitUntilDone:NO];
            break;
        }
    [NSThread sleepForTimeInterval:2];
    }
}

- (IBAction)simplePayment:(id)sender {

.... 
    [[PayPal getPayPalInst] checkoutWithPayment:payment];
}