A helper for showing loading cells in iOS Apps with Rubymotion
I'm in the process of transposing an existing application from Objective-C to Rubymotion. In doing so, I've come up with a few techniques that make life a lot easier.
Here's a simple class for adding a loading cell to a UITableView
class LoadingCell < UITableViewCell
CELL_FRAME = [[0,0], [320, 44]]
LABEL_FRAME = [[120, 11], [79, 21]]
ACTIVITY_INDICATOR_FRAME = [[92,11],[20,20]]
LABEL_TEXT = 'Loading...'
def self.loadingCellWithTableView(tableView)
tableView.dequeueReusableCellWithIdentifier(self.class.to_s) || begin
alloc.initWithFrame(CELL_FRAME)
end
end
def reuseIdentifier
self.class.to_s
end
def initWithFrame(frame)
super(frame)
addSubview(activityIndicator)
addSubview(label)
end
def label
@label ||= begin
_label = UILabel.alloc.initWithFrame(LABEL_FRAME)
_label.text = LABEL_TEXT
_label.textColor = UIColor.darkGrayColor
_label.backgroundColor = UIColor.clearColor
_label
end
end
def activityIndicator
@activityIndicator ||= begin
_activityIndicator = UIActivityIndicatorView.alloc.initWithActivityIndicatorStyle(UIActivityIndicatorViewStyleGray)
_activityIndicator.frame = ACTIVITY_INDICATOR_FRAME
_activityIndicator.startAnimating
_activityIndicator
end
end
end
And to use it:
# in my controller
def tableView(tableView, cellForRowAtIndexPath: indexPath)
# return a loading cell
LoadingCell.loadingCellWithTableView(self.tableView)
end
Here's how it looks:
Feel free to modify to suit your needs :-)
Filed under: ruby, iOS, Apps, Rubymotion, Snippets
How would you stop the loading dialog and load the actual cell when it's ready?