由于正式版的iOS5出来了,所以我也试着去升级了。于是下载了最新的Xcode,才1.7G左右,比以往的安装包要小许多。
升级Xcode后,打开以前创建的工程, 运气好,一个错误都没有,程序也能正常跑起来。由于我程序中用了ASIHttpRequest这个库,让我发现了一个小问题,就是
ASIAuthenticationDialog这个内置对话框在网络有代理的情况下出现,然后无论点cancle或是login都不能dismiss。在4.3的SDK中完全没问题,在5.0的SDK中就会在Console中看到输出:
Unbalanced calls to begin/end appearance transitions for <ASIAutorotatingViewController:>
很明显示在sdk5中, 用这个库有问题,还有在停止调式的时候,程序会有异常产生。
于是很明显示是SDK5的变化影响了ASIHttpRequest的正常使用。于是我要fix这个问题,经过我研究发现,dismiss不起作用是由于UIViewController的parentViewController不再返回正确值了,返回的是nil,而在SDK5中被presentingViewController取代了。于是在ASIAuthenticationDialog.m中找到+(void)dismiss这个方法并修改为:
+ (void)dismiss { #if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_4_3 UIViewController *theViewController = [sharedDialog presentingViewController]; [theViewController dismissModalViewControllerAnimated:YES]; #else UIViewController *theViewController = [sharedDialog parentViewController]; [theViewController dismissModalViewControllerAnimated:YES]; #endif }
还有上面那个Console的错误提示,解决方法是,在ASIAuthenticationDialog.m中找到-(void)show这个方法,并把最后一行代码[[self presentingController] presentModalViewController:self animated:YES];
修改为:UIViewController *theController = [self presentingController]; #if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_4_3 SEL theSelector = NSSelectorFromString(@"presentModalViewController:animated:"); NSInvocation *anInvocation = [NSInvocation invocationWithMethodSignature:[[theController class] instanceMethodSignatureForSelector:theSelector]]; [anInvocation setSelector:theSelector]; [anInvocation setTarget:theController]; BOOL anim = YES; UIViewController *val = self; [anInvocation setArgument:&val atIndex:2]; [anInvocation setArgument:&anim atIndex:3]; [anInvocation performSelector:@selector(invoke) withObject:nil afterDelay:1]; #else [theController presentModalViewController:self animated:YES]; #endif
这下就可以正常运行了哟, 我的问题也解决了。关于ASIHttpRequest的其它方面,到目前为止还没发现问题。