Question

我有一个tableView完成填充视图。当我点击一个单元格表时查看：didSelectRowAtIndexPath：被解雇了，但是当我写了touchesBegan：withEvent来查找tableView的触摸和Pinch事件时它没有被触发。 Tableview上面的视图是没有触发的原因，如果是，当tableView或其某个单元格被触摸或挤压时如何查找。

我找到了一种在Table View单元格中找到Pinch或touch的方法，声明了UIPinchGestureRecognizer 对象首先在tableView中：didSelectRowAtIndexPath：即

UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handlePinch:)];
[tblAccountsList addGestureRecognizer:pinch];
[pinch release];

然后写下面的选择器方法......

- (void)handlePinch:(UIGestureRecognizer *)recognizer {
    NSLog(@"Pinch");
}

当我设置断点时它正在执行，但该方法被调用了3次。如果有人发现解决方案请分享它...

提前致谢...

Answer 1

touchesBegan是一个UIView和UITableViewCell方法，而不是UIViewController＆amp; UITableViewController方法。所以你可以为UITableViewCell创建自定义类，它识别触摸事件并触摸委托它对我有用。

  //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];
}
}

Answer 2

它被调用3次，因为每次手势识别器的状态发生变化时都会调用它，而不是每次识别手势时都会调用它：）

尝试此更改：

- (void)handlePinch:(UIGestureRecognizer *)recognizer {
    if (recognizer.state == UIGestureRecognizerStateRecognized) {
        NSLog(@"Pinch");
    }
}

并查看gesture recognisers here的文档，特别是state属性。

如何在iphone中触摸或挤压tableView单元？

2 个答案: