Develop Note: Objective-C

✢ Notes

  • After add a new Button into nib/storyboard, there are some general define ways:

    • define variable: Referencing Outlets connect to the ViewController.h.

      @interface ViewController : UIViewController  
  @property (weak, nonatomic) IBOutlet UIButton *firstButton;  
@end

    • define action operation: ctrl + Button connect to the ViewController.m.

      
@implementation ViewController
  - (IBAction)firstBtnTapped:(id)sender {
      ....
  }
@end

  • NSInteger -> Int

    NSInteger number = 20;
int number2 = (int)number;

NSIndexPath *indexPath;
int row = (int)indexPath.row;

  • Get selected row on TableView

    • Implement UITableView func: didSelectRowAtIndexPath

      - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
  selectedRow = (int)indexPath.row;
}

✢ Extend class UITableViewDelegate, UITableViewDataSource in UIViewController

  • Swift

      class myViewController: UIViewcontroller {
      ....
  }

  extension myViewController: UITableViewDelegate, UITableViewDataSource {
      //Set table rows
      func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
          ....
      }
      //Draw table cells
      func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
          ....
      }
      ....
  }

  • Objective-C

      @interface ViewController : UIViewController<UITableViewDelegate, UITableViewDataSource>
      ....
  @end

  @implementation ViewController
      //Set table rows
      - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
          ....
      }
      //Draw table cells
      - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
          ....
      }        
      ....
  @end


✢ References

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