// NOTE: GameCenter does not guarantee that callback blocks will be execute on the main thread.
// As such, your application needs to be very careful in how it handles references to view
// controllers. If a view controller is referenced in a block that executes on a secondary queue,
// that view controller may be released (and dealloc'd) outside the main queue. This is true
// even if the actual block is scheduled on the main thread. In concrete terms, this code
// snippet is not safe, even though viewController is dispatching to the main queue:
//
// [object doSomethingWithCallback: ^()
// {
// dispatch_async(dispatch_get_main_queue(), ^(void)
// {
// [viewController doSomething];
// });
// }];
//
// UIKit view controllers should only be accessed on the main thread, so the snippet above may
// lead to subtle and hard to trace bugs. Many solutions to this problem exist. In this sample,
// I'm bottlenecking everything through "callDelegateOnMainThread" which calls "callDelegate".
// Because "callDelegate" is the only method to access the delegate, I can ensure that delegate
// is not visible in any of my block callbacks.
- (
void) callDelegate: (SEL) selector withArg: (
id) arg error: (NSError*
) err
{
assert([NSThread isMainThread]);
if([
delegate respondsToSelector: selector])
{
if(arg !=
NULL)
{
[
delegate performSelector: selector withObject: arg withObject: err];
}
else
{
[
delegate performSelector: selector withObject: err];
}
}
else
{
NSLog(
@"Missed Method");
}
}
- (
void) callDelegateOnMainThread: (SEL) selector withArg: (
id) arg error: (NSError*
) err
{
dispatch_async(dispatch_get_main_queue(), ^(
void)
{
[self callDelegate: selector withArg: arg error: err];
});
}
- (
void) authenticateLocalUser
{
if([GKLocalPlayer localPlayer].authenticated ==
NO)
{
[[GKLocalPlayer localPlayer] authenticateWithCompletionHandler:^(NSError *
error)
{
[self callDelegateOnMainThread: @selector(processGameCenterAuth:) withArg: NULL error: error];
}];
}
}
南来地,北往的,上班的,下岗的,走过路过不要错过!
======================个性签名=====================
之前认为Apple 的iOS 设计的要比 Android 稳定,我错了吗?
下载的许多客户端程序/游戏程序,经常会Crash,是程序写的不好(内存泄漏?刚启动也会吗?)还是iOS本身的不稳定!!!
如果在Android手机中可以简单联接到ddms,就可以查看系统log,很容易看到程序为什么出错,在iPhone中如何得知呢?试试Organizer吧,分析一下Device logs,也许有用
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