转:升级到iOS5后ASIHttpRequest库问题及解决方法
2012-02-08 19:34 张智清 阅读(669) 评论(0) 编辑 收藏 举报由于正式版的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
}
这样编译出来的程序能在ios5设备上正确运行,但是在ios5以下的设备则会crash。因为是库,所以要考虑到兼容不同版本,于是进一步修改为:
+ (void)dismiss
{
#if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_4_3
if ([sharedDialog respondsToSelector:@selector(presentingViewController)])
{
UIViewController *theViewController = [sharedDialog presentingViewController];
[theViewController dismissModalViewControllerAnimated:YES];
}
else
{
UIViewController *theViewController = [sharedDialog parentViewController];
[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。
本文转载自:http://blog.csdn.net/favormm/article/details/6893465 仅供自己学习参考。