iOS_判断数组为空

//判断数组

if(self.dataArray!=nil&&![self.dataArray isKindOfClass:[NSNull class]]&&self.dataArray.count!=0){

}

//判断字典 

NSDictionary*dict=self.datas[indexPath.row];

if([[dict allKeys]containsObject:@"key"]){

cell.textLabel.text=[dict valueForKey:@"key"];

}else{cell.textLabel.text=@"没有对应的key值";

}

//判断字符串

if(string==nil||string==NULL||[string isKindOfClass:[NSNull class]]||[[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]length]==0)

{

//空

}else{

//不为空

}