blacklee

- (void) tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
    // somecode
    [self performSelectorInBackground:@selector(loadMoreData:) withObject:nil];
}

- (void) loadMoreData:(id) s {
    // some code to pull data from remote
    dispatch_async(dispatch_get_main_queue(), ^{
      [self.tableView reloadData];
    });

blacklee

UITableViewCell reuse problem.

appearance:
dynamic height cell, with dynamic UILabel...
the cell's height is calculated correctly, but the label shows wrong.
cell display incorrect before reuse, after reused, everything displays well.
in CostomCell's layoutSubviews method, each subview's frame is right if you print them.

reason:
App's using xib to draw custom UITableViewCell.

blacklee

class ApplicationController < ActionController::Base
  before_filter :check_token, :only => [some_actions...]
  def check_token  
    token_file = File.join(Rails.root.to_s, "tmp", "tokens", params[:__token__])
    if File.exists?(token_file)
      require 'fileutils'
      FileUtils.rm(token_file)
      return true  
    end  
    false  

blacklee

# last modify time of file
stat -f "%m" $file

blacklee

# Files
find . -type f | wc -l

# Directories
find . -type d | wc -l

# Block special
find . -type b | wc -l

# Character special

blacklee

cd /path/to/dir && wget -w 30 -i url-list.txt


# run by crond, */5 * * * * bash /path/to/dir/test.sh > /dev/null

cd /path/to/dir
for i in `ls *.zip`; do
  unzip -t $i > /dev/null
  if [[ $? -eq 0 ]]; then
    mv $i download_done/

blacklee

sudo find / -size +200M -ls
sudo find / -size +200M -size -500M -ls