关于tableview动态添加一行新数据
UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(insertNewObject:)];
self.navigationItem.rightBarButtonItem = addButton;
- (void)insertNewObject:(id)sender
{
if (!_objects) {
_objects = [[NSMutableArray alloc] init];
}
[_objects insertObject:[NSDate date] atIndex:0];
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
[self.tableView insertRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
}
以上是MasterViewController自动生成的源代码但在实际操作中自己碰到过一些问题
粘贴主要代码，解释原因
[OrderModel GetItemsWithBlock:^(NSMutableArray *items,NSError *error)
{
if (error) {
[[[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Error", nil) message:[error localizedDescription] delegate:nil cancelButtonTitle:nil otherButtonTitles:NSLocalizedString(@"OK", nil), nil] show];
} else {
_items = items;
_tempitems = items;
[ordertableView reloadData];
};
} forStoreId:19311 withStatus:status withOrderID:0];
此函数请求数据
- (void)insertNewObject:(id)sender
{
if (!_items) {
_items = [[NSMutableArray alloc] init];
}
if (_tempitems.count) {
NSLog(@"%i",_tempitems.count);
}
NSLog(@"object0=%@",[_tempitems objectAtIndex:0]);
[_items insertObject:[_tempitems objectAtIndex:0] atIndex:0];
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
[ordertableView insertRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
}
此函数动态添加一行，运行时会到红色部分崩溃，为什么呢原因是_items和_tempitems都是NSArray，但是申明变量的时候
@property NSMutableArray *items;
@property NSMutableArray *tempitems;
原来在model层传值的时候
[[AFAppDotNetAPIClient sharedClient]getPath:@"orders/list" parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
id items = [responseObject objectForKey:@"orders"];
NSMutableArray *mutablePosts = [NSMutableArray arrayWithCapacity:[items count]];
for (NSDictionary *attributes in items) {
OrderModel *post = [[OrderModel alloc] initWithAttributes:attributes];
[mutablePosts addObject:post];
}
if (block) {
block([NSArray arrayWithArray:mutablePosts], nil);
}
解决办法，讲NSArray换成NSMutableArray，问题解决NSArray没有insertObject：atIndex
这个方法只有NSMutableArray才有，它是可变数组，才能动态添加