How to subclass UITableView with delegate? - ios

Question

I'm subclassing UITableView in my app. It's set up to be it's own delegate.
#interface TableView : UITableView <UITableViewDelegate, UITableViewDataSource>
#property (nonatomic, assign) id delegate;
- (id)initWithFrame:(CGRect)frame;
#end
#implementation TableView
#synthesize delegate;
- (id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
UIView *footerView = [[UIView alloc] initWithFrame:CGRectMake(0, self.frame.size.height-144, self.frame.size.width, 40)];
super.delegate = self;
super.dataSource = self;
self.tableFooterView = footerView;
}
return self;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return 15;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
return [self.delegate tableView:tableView cellForRowAtIndexPath:indexPath];
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[tableView deselectRowAtIndexPath:indexPath animated:YES];
NSLog(#"Selected row!");
}
#end
Now, what I don't understand is how I TableView can be the delegate of UITableView, but also have a different delegate property that it pipes some functions to sometimes. So, I'd like for - for example - numberOfRowsInSection to be handled by this class, but for - for example - didSelectRowAtIndexPath to be forwarded to the UIViewController or whatever's presenting it.

Answer 1

Each of the delegate methods have a property (UITableView *)tableView you can use this to identify which table views action to be performed
Eg lets say you have 2 table views tableView1 & tableView2 now do something like this
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
if tableView == self {
return [self.delegate tableView:tableView cellForRowAtIndexPath:indexPath];
} else if tableView == tableView2 {
// Do something
}
}
You can do the same concept using super and self calls
EDIT
Create a property called customDelegate, now in your ViewController set customDelegate = self and keep the TableView's delegate same
Now when you wish the class should handle the call just don't do anything as the behaves would be default
But if you wish that your viewController should handle the call then just pipe it using that customDelegate property
Eg
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
if <SOME_CONDITION> {
// This will cause the TableView's delegate to be called
return [self.delegate tableView:tableView cellForRowAtIndexPath:indexPath];
} else {
// We wish the ViewController to handler this action then
return [self.customDelegate tableView:tableView cellForRowAtIndexPath:indexPath];
}
}