Why is there extra padding at the top of my UITableView with style UITableViewStyleGrouped in iOS7
Starting in iOS7, there is additional space at the top of my UITableView's which have a style UITableViewStyleGrouped. Here is an example: The tableview starts at the first arrow, there are 35 pixels of unexplained padding, then the green header is a UIView returned by viewForHeaderInSection (where the section is 0). Can anyone explain where this 35-pixel amount is coming from and how I can get ri
When to use UIKIT_EXTERN vs just extern
I'm guessing I would only use UIKIT_EXTERN if there is a chance of C++ code in my project that may use the variable. Right. This is the primary reason. This happens because C and C++ symbols use different naming conventions. There is a less common reason: UIKIT_EXTERN also specifies default visibility. Note: More generally, "symbol" -- not "variable" since extern could also be applied to constants
Rails Routes Namespaces and form_for
I have namespace in my routes.rb namespace :businesses do resources :registration end My controller is in a subdirectory businesses/registration_controller. def new @business = Business.new end In my view, I want to do this form_for @business do |f| ... but I am getting the following error: No route matches {:controller=>"businesses", :action=>"create"} Restarted the server and I'm also getting th
How to return an empty ActiveRecord relation?
If I have a scope with a lambda and it takes an argument, depending on the value of the argument, I might know that there will not be any matches, but I still want to return a relation, not an empty array: scope :for_users, lambda { |users| users.any? ? where("user_id IN (?)", users.map(&:id).join(',')) : [] } What I really want is a "none" method, the opposite of "all", that returns a relation th
Writing tests with RSpec for Redis with Rails
I have a model class that caches data in redis. The first time I call a method on the model, it computes a JSON/Hash value and stores it in Redis. Under certain circumstances I 'flush' that data and it gets recomputed on the next call. Here's the code snippet similar to the one I use to store the data in Redis: def cache_data self.data_values = data_to_cache REDIS.set(redis_key,ActiveSupport::JSON
Ruby gems installation error
When I am trying to install a gem or run anything with gem command, I see this warning, Error loading RubyGems plugin "/Users/ender/.rvm/gems/ruby-1.9.3-p194@global/gems/rubygems-bundler-0.9.0/lib/rubygems_plugin.rb": undefined method `first' for #<String:0x007ffedc0964f0> (NoMethodError) I searched it but I could not find anything out. What is the problem and how can I fix it? Note: I cannot inst
vim in tmux background color changes when paging
I am using vim in 256 color mode on Solaris (connected via Putty on Windows). Everything looks great and works fine outside of tmux, but within tmux the background color changes periodically when paging/scrolling through a file. Here is how it's supposed to look: Here is how it appears after paging around a bit: Thanks!
How to enable the new Objective-C object literals on iOS?
When I create a new project with Xcode 4.4 and add these lines: NSDictionary *test = @{ @"key" : @"test value" }; NSString *value = test[@"key"]; NSLog(@"value is: %@", value); it compiles with no warnings and executes as expected. Adding the same lines to an existing project produces the compiler error: NSString *value = test[@"key"]; <-- Expected method to read dictionary element not found on ob
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