(转)升级到iOS5后ASIHttpRequest库问题及解决方法

 

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:

View Code
 1 + (void)dismiss
2 {
3 #if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_4_3
4 UIViewController *theViewController = [sharedDialog presentingViewController];
5 [theViewController dismissModalViewControllerAnimated:YES];
6 #else
7 UIViewController *theViewController = [sharedDialog parentViewController];
8 [theViewController dismissModalViewControllerAnimated:YES];
9 #endif
10 }



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:

View Code
 1 UIViewController *theController = [self presentingController];
2
3 #if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_4_3
4 SEL theSelector = NSSelectorFromString(@"presentModalViewController:animated:");
5 NSInvocation *anInvocation = [NSInvocation invocationWithMethodSignature:[[theController class] instanceMethodSignatureForSelector:theSelector]];
6
7 [anInvocation setSelector:theSelector];
8 [anInvocation setTarget:theController];
9
10 BOOL anim = YES;
11 UIViewController *val = self;
12 [anInvocation setArgument:&val atIndex:2];
13 [anInvocation setArgument:&anim atIndex:3];
14
15 [anInvocation performSelector:@selector(invoke) withObject:nil afterDelay:1];
16 #else
17
18 [theController presentModalViewController:self animated:YES];
19 #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。

posted on 2012-02-21 16:18  east520  阅读(220)  评论(0)    收藏  举报

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