iOS JavaScriptCore与H5交互时出现异常提示

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在利用JavaScriptCore与H5交互时出现异常提示：

This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes. This will cause an exception in a future release.

从字面意思看，是因为在后台线程修改了UI，于是乎开始验证

_weak typeof(self)weakSelf = self; JSContext *tContext = [weakSelf.webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"]; tContext[@"jsredirect"] = ^(){ NSArray *tArgs = [JSContext currentArguments];
JSValue *tJSValue = [tArgs firstObject]; @try
{
NSDictionary *tActionValueDic = [tJSValue toDictionary]; NSLog(@"JSValue:%@", tActionValueDic); NSString *tUrlStr = tActionValueDic[@"url"]; if ([tUrlStr isEqualToString:@"chartDispose"]) {
[[NSUserDefaults standardUserDefaults] setInteger:0 forKey:@"WebKitCacheModelPreferenceKey"];
[[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"WebKitDiskImageCacheEnabled"];
[[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"WebKitOfflineWebApplicationCacheEnabled"];
[[NSUserDefaults standardUserDefaults] synchronize];
}else{
CGGradeJumpWebViewController *vc = [[CGGradeJumpWebViewController alloc]init];
vc.urlStr = tUrlStr;
NSLog(@"Current Thread:%@",[NSThread currentThread]);
dispatch_async(dispatch_get_main_queue(), ^{
//UI修改
NSLog(@"Current Thread:%@",[NSThread currentThread]);
[weakSelf.navigationController pushViewController:vc animated:YES];
});
} }
@catch (NSException *exception)
{
NSLog(@"exception:%@", exception);
}
};