今天折騰了半天的問題,百尺竿頭更進(jìn)一步.

bug現(xiàn)象-在iOS8 系統(tǒng)上出現(xiàn)

1.追根溯源

UIalertcontroller里面添加的textfield旁邊會(huì)有兩個(gè)黑色的框，自己拆視圖(Debug View 就是xcode的功能)發(fā)現(xiàn)里面有一個(gè)tableview.里面cell的背景色是黑色

2.找它

2.1>通過runtime 找不到這個(gè)tableView

   unsigned int numIvars; //成員變量個(gè)數(shù)
             
   Ivar *vars = class_copyIvarList(NSClassFromString(@"UIAlertController"), &numIvars);
             
           //Ivar *vars = class_copyIvarList([UIView class], &numIvars);   
          NSString *key=nil;
             
                 for(int i = 0; i < numIvars; i++) {

                 Ivar thisIvar = vars[i];
                 
                         key = [NSString stringWithUTF8String:ivar_getName(thisIvar)];  //獲取成員變量的名字
                 
                         NSLog(@"variable name :%@", key);
                 
                         key = [NSString stringWithUTF8String:ivar_getTypeEncoding(thisIvar)]; //獲取成員變量的數(shù)據(jù)類型
                 
                         NSLog(@"variable type :%@", key);
                 
                     }
                 free(vars);

2.2>循環(huán)遍歷子視圖

首先判斷是不是8的系統(tǒng)

     if (SYSTEM_VERSION_LESS_THAN(@"9.0"))
             {//循環(huán)遍歷方法
                 [self wipeOutBlackColorInIOS8WithView:alert.view];
             }

-(void)wipeOutBlackColorInIOS8WithView:(UIView *)fatherview
{
    for (UIView *view in fatherview.subviews)
    {
        NSLog(@"view_class:%@",NSStringFromClass([view class]));
        
        if ([NSStringFromClass([view class]) isEqualToString:@"_UIAlertControllerShadowedScrollView"])
        {
            
        }
        if ([view isKindOfClass:[UITableView class]])
        {
            UITableView *tableView =(UITableView *)view;
            NSInteger sections = tableView.numberOfSections;
            for (int section = 0; section < sections; section++)
            {
                NSInteger rows =[tableView numberOfRowsInSection:section];
                for (int row = 0; row < rows; row++)
                {//找到tableView 改變cell背景色
                    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:row inSection:section];
                    UITableViewCell *cell =[tableView cellForRowAtIndexPath:indexPath];
                    [cell setBackgroundColor:kClearColor];
                }
            }
        }
        else
        {
            if (view.subviews.count)
            {
                [self wipeOutBlackColorInIOS8WithView:view];
            }
        }
    }
}

堅(jiān)持就是勝利