升級(jí)到iOS5后ASIHttpRequest庫(kù)問(wèn)題及解決方法
由于正式版的iOS5出來(lái)了，所以我也試著去升級(jí)了。于是下載了最新的Xcode，才1.7G左右，比以往的安裝包要小許多。
升級(jí)Xcode后，打開以前創(chuàng)建的工程， 運(yùn)氣好，一個(gè)錯(cuò)誤都沒(méi)有，程序也能正常跑起來(lái)。由于我程序中用了ASIHttpRequest這個(gè)庫(kù)，讓我發(fā)現(xiàn)了一個(gè)小問(wèn)題，就是
ASIAuthenticationDialog這個(gè)內(nèi)置對(duì)話框在網(wǎng)絡(luò)有代理的情況下出現(xiàn)，然后無(wú)論點(diǎn)cancle或是login都不能dismiss。在4.3的SDK中完全沒(méi)問(wèn)題，在5.0的SDK中就會(huì)在Console中看到輸出：
Unbalanced calls to begin/end appearance transitions for <ASIAutorotatingViewController:>
很明顯示在sdk5中， 用這個(gè)庫(kù)有問(wèn)題，還有在停止調(diào)式的時(shí)候，程序會(huì)有異常產(chǎn)生。
于是很明顯示是SDK5的變化影響了ASIHttpRequest的正常使用。于是我要fix這個(gè)問(wèn)題，經(jīng)過(guò)我研究發(fā)現(xiàn)，dismiss不起作用是由于UIViewController的parentViewController不再返回正確值了，返回的是nil，而在SDK5中被presentingViewController取代了。于是在ASIAuthenticationDialog.m中找到+(void)dismiss這個(gè)方法并修改為：
- + (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
- }
這樣編譯出來(lái)的程序能在ios5設(shè)備上正確運(yùn)行，但是在ios5以下的設(shè)備則會(huì)crash。因?yàn)槭菐?kù)，所以要考慮到兼容不同版本，于是進(jìn)一步修改為：
- + (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
- }
還有上面那個(gè)Console的錯(cuò)誤提示，解決方法是，在ASIAuthenticationDialog.m中找到-(void)show這個(gè)方法，并把最后一行代碼
- [[self presentingController] presentModalViewController:self animated:YES];
修改為：
- 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
這下就可以正常運(yùn)行了喲， 我的問(wèn)題也解決了。關(guān)于ASIHttpRequest的其它方面，到目前為止還沒(méi)發(fā)現(xiàn)問(wèn)題。
