dehengxu

Note: these instructions are for pre-Sierra MacOS. Sierra Users: see https://gist.github.com/gravitylow/fb595186ce6068537a6e9da6d8b5b96d by @gravitylow.

If you are getting this in gdb on OSX while trying to run a program:

Unable to find Mach task port for process-id 57573: (os/kern) failure (0x5).
 (please check gdb is codesigned - see taskgated(8))

1. Open Keychain Access

dehengxu

使用 gdb 在 macOS 上进行调试

步骤1: 为 gdb 签名

1. 在你的系统KeyChain 中创建一个自签名的根证书，用途选择 代码签名或codesign，我的证书常用名为 gdb-cert
2. 配置该证书的 codesign 为始终信任。
3. 用这个证书来为 gdb 程序签名。 codesign -fs gdb-cert /usr/local/Cellar/gdb/8.0.1/bin/gdb

步骤2: 启动 gdb

1. gdb
2. 通过 file 指令加载目标执行文件。file ./build/a.out

dehengxu

Setup new Mac from scratch

Re-create admin user

1. Reboot with command + s
2. Enter /sbin/mount -uw in Terminal
3. rm var/db/.AppleSetupDone Remove cache data.
4. Reboot again.

Install Xcode

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server {
    listen          80;
    server_name     www.example.com;

    root            /var/www/vhosts/example.com/public/;

    location /
    {
        index index.php index.html index.htm;
    }

dehengxu

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    NSString *identifier = @"_collection_view_cell_identifier";

    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];
    if (!cell) {
        cell = [[UICollectionViewCell alloc] initWithFrame:CGRectMake(0, 0, 48, 48)];
    }
    
    return cell;

dehengxu

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString *identifier = @"_table_view_cell_identifier";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
    
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
    }
    
    if (cell) {