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);
}
在表格视图中，您可以添加
- (void)viewDidLoad {
[super viewDidLoad];
// Add a pinch gesture recognizer to the table view.
UIPinchGestureRecognizer* pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handlePinch:)];
[self.tableView addGestureRecognizer:pinchRecognizer];
// Set up default values.
self.tableView.sectionHeaderHeight = HEADER_HEIGHT;
/*
The section info array is thrown away in viewWillUnload, so it's OK to set the default values here. If you keep the section information etc. then set the default values in the designated initializer.
*/
rowHeight_ = DEFAULT_ROW_HEIGHT;
openSectionIndex_ = NSNotFound;
}
#pragma mark Handling pinches
-(void)handlePinch:(UIPinchGestureRecognizer*)pinchRecognizer {
/*
There are different actions to take for the different states of the gesture recognizer.
* In the Began state, use the pinch location to find the index path of the row with which the pinch is associated, and keep a reference to that in pinchedIndexPath. Then get the current height of that row, and store as the initial pinch height. Finally, update the scale for the pinched row.
* In the Changed state, update the scale for the pinched row (identified by pinchedIndexPath).
* In the Ended or Canceled state, set the pinchedIndexPath property to nil.
*/
if (pinchRecognizer.state == UIGestureRecognizerStateBegan) {
CGPoint pinchLocation = [pinchRecognizer locationInView:self.tableView];
NSIndexPath *newPinchedIndexPath = [self.tableView indexPathForRowAtPoint:pinchLocation];
self.pinchedIndexPath = newPinchedIndexPath;
SectionInfo *sectionInfo = [self.sectionInfoArray objectAtIndex:newPinchedIndexPath.section];
self.initialPinchHeight = [[sectionInfo objectInRowHeightsAtIndex:newPinchedIndexPath.row] floatValue];
// Alternatively, set initialPinchHeight = uniformRowHeight.
[self updateForPinchScale:pinchRecognizer.scale atIndexPath:newPinchedIndexPath];
}
else {
if (pinchRecognizer.state == UIGestureRecognizerStateChanged) {
[self updateForPinchScale:pinchRecognizer.scale atIndexPath:self.pinchedIndexPath];
}
else if ((pinchRecognizer.state == UIGestureRecognizerStateCancelled) || (pinchRecognizer.state == UIGestureRecognizerStateEnded)) {
self.pinchedIndexPath = nil;
}
}
}
-(void)updateForPinchScale:(CGFloat)scale atIndexPath:(NSIndexPath*)indexPath {
if (indexPath && (indexPath.section != NSNotFound) && (indexPath.row != NSNotFound)) {
CGFloat newHeight = round(MAX(self.initialPinchHeight * scale, DEFAULT_ROW_HEIGHT));
SectionInfo *sectionInfo = [self.sectionInfoArray objectAtIndex:indexPath.section];
[sectionInfo replaceObjectInRowHeightsAtIndex:indexPath.row withObject:[NSNumber numberWithFloat:newHeight]];
// Alternatively, set uniformRowHeight = newHeight.
/*
Switch off animations during the row height resize, otherwise there is a lag before the user's action is seen.
*/
BOOL animationsEnabled = [UIView areAnimationsEnabled];
[UIView setAnimationsEnabled:NO];
[self.tableView beginUpdates];
[self.tableView endUpdates];
[UIView setAnimationsEnabled:animationsEnabled];
}
}