iphone - 在 iPhone 的 UITableViewController 类中未调用 touchesBegan 方法

Question

如何touchesBegan: withEvent:在 UITableViewController 类中使用方法？

UITableViewController 是 UIViewController 类的子类。那么为什么该方法在 UITableViewController 中不起作用呢？

Answer 1

I had a similar problem, and found a different approach that doesn't involve subclassing UITableView. Another way to do this is to add a gesture recognizer to the UITableViewController's view.

I put this code in the UITableViewController's viewDidLoad:

UITapGestureRecognizer * tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
[self.view addGestureRecognizer:tap];

And implemented the event handler:

- (void)handleTap:(UITapGestureRecognizer *)recognizer
{
    // your code goes here...
}

I know this solution doesnt use touchesBegan, but I found it was a simple solution to the same problem.

Answer 2

touchesBegan 除了是 UIViewController 方法之外，也是 UIView 方法。

要覆盖它，您需要继承 UIView 或 UITableView 而不是控制器。

Answer 3

Here is a UITableView subclass solution that worked for me. Make a subclass of UITableView and override hitTest:withEvent: as below:

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {

    static UIEvent *e = nil;

    if (e != nil && e == event) {
        e = nil;
        return [super hitTest:point withEvent:event];
    }

    e = event;

    if (event.type == UIEventTypeTouches) {
        NSSet *touches = [event touchesForView:self];
        UITouch *touch = [touches anyObject];
        if (touch.phase == UITouchPhaseBegan) {
            NSLog(@"Touches began");
        }
    }
    return [super hitTest:point withEvent:event];
}

Answer 4

touchesBegan 是 UIView 和 UITableViewCell 方法，而不是 UIViewController 和 UITableViewController 方法。因此，您可以为 UITableViewCell 创建自定义类，它可以识别触摸事件并为我工作的触摸委托。

  //TableViewCell.h

#import <UIKit/UIKit.h>

@class Util;

@interface TableViewCell : UITableViewCell {

}
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier;

@end
   //TableViewCell.m
#import "TableViewCell.h"
@implementation TableViewCell

-(id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier      format:(NSString*)ec_format{

    if (self) {
        self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];

   }

   return self;
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
 {
//you receive touch here 
    NSLog(@"Category Touch %@",self.frame);


}

祝你有美好的一天

Answer 5

IN SWIFT - I came across this question while searching for a Swift 2 solution. The answer posted by @Steph Sharp helped me work out the the problem in Swift so I though I'de post it on here. Here you go:

class CalcOneTableViewController: UITableViewController {
      override func viewDidLoad() {
         super.viewDidLoad()
         let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "handleTap:")
         self.view.addGestureRecognizer(tap)
}

Function

func handleTap(recognizer: UITapGestureRecognizer) {
    // Do your thing.
}