This gist contains all the code snippets for the blog post "NSInvocation" at http://www.apokrupto.com/blog-1/2016/3/14/ogbhxwpj9n4qh79edsvpdyvbpklr3w
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June 11, 2016 12:40
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| @interface ViewController(Refactor) | |
| @property (nonnull, readonly) NSArray *cellInfo; | |
| @end | |
| @implementation ViewController (Refactor) | |
| - (NSArray *)cellInfo { | |
| return @[ @{ @"text": @"Awful code", @"block": ^{ [self showAlert]; } }, | |
| @{ @"text": @"Really awful code", @"block": ^{ [self segue]; } } ]; | |
| } | |
| - (void)showAlert { | |
| UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Bad" | |
| message:@"Terrible" | |
| preferredStyle:UIAlertControllerStyleAlert]; | |
| [alert addAction:[UIAlertAction actionWithTitle:@"Please stop" | |
| style:UIAlertActionStyleCancel | |
| handler:NULL]]; | |
| [self presentViewController:alert animated:YES completion:NULL]; | |
| } | |
| - (void)segue { | |
| [self performSegueWithIdentifier:@"Unforgivable" sender:self]; | |
| } | |
| @end | |
| @implementation ViewController | |
| - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { | |
| return self.cellInfo.count; | |
| } | |
| - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { | |
| UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"]; | |
| cell.textLabel.text = self.cellInfo[indexPath.row][@"text"]; | |
| return cell; | |
| } | |
| - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { | |
| void (^operation)() = self.cellInfo[indexPath.row][@"block"]; | |
| operation(); | |
| } | |
| @end |
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| - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { | |
| UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"]; | |
| if (indexPath.row == 0) { | |
| cell.textLabel.text = @"Awful code"; | |
| } | |
| else if (indexPath.row == 1) { | |
| cell.textLabel.text = @"Really awful code"; | |
| } | |
| else if (indexPath.row == 2) { | |
| cell.textLabel.text = @"Make it stop"; | |
| } | |
| else if (indexPath.row == 3) { | |
| cell.textLabel.text = @"Ohmygodwereallgoingtodie"; | |
| } | |
| else { | |
| cell.textLabel.text = @"You don't do this, do you?"; | |
| } | |
| return cell; | |
| } |
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| @implementation ViewController | |
| - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { | |
| return 2; | |
| } | |
| - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { | |
| UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"]; | |
| if (indexPath.row == 0) { | |
| cell.textLabel.text = @"Awful code"; | |
| } | |
| else { | |
| cell.textLabel.text = @"Really awful code"; | |
| } | |
| return cell; | |
| } | |
| - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { | |
| if (indexPath.row == 0) { | |
| UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Bad" | |
| message:@"Terrible" | |
| preferredStyle:UIAlertControllerStyleAlert]; | |
| [alert addAction:[UIAlertAction actionWithTitle:@"Please stop" | |
| style:UIAlertActionStyleCancel | |
| handler:NULL]]; | |
| [self presentViewController:alert animated:YES completion:NULL]; | |
| } | |
| else { | |
| [self performSegueWithIdentifier:@"Unforgivable" sender:self]; | |
| } | |
| } | |
| @end |
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| @implementation NSInvocation (Apokrupto) | |
| + (instancetype)invocationForSelector:(SEL)selector target:(id)target { | |
| NSMethodSignature *signature = [target methodSignatureForSelector:selector]; | |
| NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature]; | |
| invocation.selector = selector; | |
| invocation.target = target; | |
| return invocation; | |
| } | |
| @end | |
| @interface ViewController(Refactor) | |
| @property (nonnull, readonly) NSArray *cellInfo; | |
| @end | |
| @implementation ViewController (Refactor) | |
| - (NSArray *)cellInfo { | |
| return @[ @{ @"text": @"Awful code", | |
| @"selector": [NSInvocation invocationForSelector:@selector(showAlert) target:self] }, | |
| @{ @"text": @"Really awful code", | |
| @"selector": [NSInvocation invocationForSelector:@selector(segue) target:self] } ]; | |
| } | |
| - (void)showAlert { | |
| UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Bad" | |
| message:@"Terrible" | |
| preferredStyle:UIAlertControllerStyleAlert]; | |
| [alert addAction:[UIAlertAction actionWithTitle:@"Please stop" | |
| style:UIAlertActionStyleCancel | |
| handler:NULL]]; | |
| [self presentViewController:alert animated:YES completion:NULL]; | |
| } | |
| - (void)segue { | |
| [self performSegueWithIdentifier:@"Unforgivable" sender:self]; | |
| } | |
| @end | |
| @implementation ViewController | |
| - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { | |
| return self.cellInfo.count; | |
| } | |
| - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { | |
| UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"]; | |
| cell.textLabel.text = self.cellInfo[indexPath.row][@"text"]; | |
| return cell; | |
| } | |
| - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { | |
| NSInvocation *invocation = self.cellInfo[indexPath.row][@"selector"]; | |
| [invocation invoke]; | |
| } | |
| @end |
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| @implementation ViewController (Refactor) | |
| - (void)showAlert { | |
| UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Bad" | |
| message:@"Terrible" | |
| preferredStyle:UIAlertControllerStyleAlert]; | |
| [alert addAction:[UIAlertAction actionWithTitle:@"Please stop" | |
| style:UIAlertActionStyleCancel | |
| handler:NULL]]; | |
| [self presentViewController:alert animated:YES completion:NULL]; | |
| } | |
| - (void)segue { | |
| [self performSegueWithIdentifier:@"Unforgivable" sender:self]; | |
| } | |
| @end | |
| @implementation ViewController | |
| - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { | |
| return 2; | |
| } | |
| - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { | |
| UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"]; | |
| if (indexPath.row == 0) { | |
| cell.textLabel.text = @"Awful code"; | |
| } | |
| else { | |
| cell.textLabel.text = @"Really awful code"; | |
| } | |
| return cell; | |
| } | |
| - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { | |
| if (indexPath.row == 0) { | |
| [self showAlert]; | |
| } | |
| else { | |
| [self segue]; | |
| } | |
| } | |
| @end |
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| @interface ViewController(Refactor) | |
| @property (nonnull, readonly) NSArray *cellInfo; | |
| @end | |
| @implementation ViewController (Refactor) | |
| - (NSArray *)cellInfo { | |
| return @[ @{ @"text": @"Awful code", @"selector": @selector(showAlert) }, | |
| @{ @"text": @"Really awful code", @"selector": @selector(segue) } ]; | |
| } | |
| - (void)showAlert { | |
| UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Bad" | |
| message:@"Terrible" | |
| preferredStyle:UIAlertControllerStyleAlert]; | |
| [alert addAction:[UIAlertAction actionWithTitle:@"Please stop" | |
| style:UIAlertActionStyleCancel | |
| handler:NULL]]; | |
| [self presentViewController:alert animated:YES completion:NULL]; | |
| } | |
| - (void)segue { | |
| [self performSegueWithIdentifier:@"Unforgivable" sender:self]; | |
| } | |
| @end | |
| @implementation ViewController | |
| - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { | |
| return self.cellInfo.count; | |
| } | |
| - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { | |
| UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"]; | |
| cell.textLabel.text = self.cellInfo[indexPath.row][@"text"]; | |
| return cell; | |
| } | |
| - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { | |
| [self performSelector:self.cellInfo[indexPath.row][@"selector"]]; | |
| } | |
| @end |
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