給控件添加單擊事件－－UITapGestureRecognizer

在Iphone開發中，像UIimageView是不支持點擊的，但往往我們卻有很多能在Image上點擊的需求，比如一個自定義的TableViewCell中放入三個UIimageView，在這里命名為imageleft，imagemiddle，imggeright，當tableView加載后，單擊tableView中某一行中的image，我便進入該圖片的詳細頁面。

當然，現在的最新版支持手勢控件，只要拖一個這樣的控件到UIImageView上，實現它的委托就可以了。若版本太低不支持這樣的控件，你便只好老老實實的親手寫代碼了。

#import <UIKit/UIKit.h>

@protocol TableGridViewCellDelegate;

@interface TableGridViewCell : UITableViewCell {

}

@property (nonatomic,retain) IBOutlet UIImageView *imageleft;
@property (nonatomic,retain) IBOutlet UIImageView *imagemiddle;
@property (nonatomic,retain) IBOutlet UIImageView *imageright;
@property (nonatomic,assign) id<TableGridViewCellDelegate> delegate;
...
- (void) configGesture;
- (void) handTap:(UITapGestureRecognizer*) gesture;
...
@end

@protocol TableGridViewCellDelegate <NSObject>
- (void) tapedImageViewInCell:(UITableViewCell*)cell withIndex:(int)index;
@end

//m文件
#import "TableGridViewCell.h"

@implementation TableGridViewCell

@synthesize imageleft,imagemiddle,imageright,delegate;

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        // Initialization code
    }
    return self;
}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
    [super setSelected:selected animated:animated];

    // Configure the view for the selected state
}

-(void) dealloc{
    SAFE_RELEASE(imageleft);
    SAFE_RELEASE(imagemiddle);
    SAFE_RELEASE(imageright);
    [super dealloc];
}

- (void) configGesture
{
    UITapGestureRecognizer *_left = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handTap:)];
    [imageleft addGestureRecognizer:_left];
    SAFE_RELEASE(_left);
    
    UITapGestureRecognizer *_mid = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handTap:)];
    [imagemiddle addGestureRecognizer:_mid];
    SAFE_RELEASE(_mid);
    
    UITapGestureRecognizer *_right = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handTap:)];
    [imageright addGestureRecognizer:_right];
    SAFE_RELEASE(_right);
}

- (void) handTap:(UITapGestureRecognizer*) gesture
{
    if ([delegate respondsToSelector:@selector(tapedImageViewInCell:withIndex:)]) {
        UIImageView *v = (UIImageView*)gesture.view;
        [delegate tapedImageViewInCell:self withIndex:v.tag];
    }
}

#pragma mark -
#pragma mark TableGridViewCellDelegate
- (void) tapedImageViewInCell:(UITableViewCell*)cell withIndex:(int)index
{
    int row = [myTable indexPathForCell:cell].row;
    VODItem *it = (VODItem*)[ipListarry objectAtIndex:row*3+index];
    NSString *preview_Url = [[NSString alloc] initWithFormat:@"%@",it.Preview_Url];

    IPCellDetailInfo *IPCellDetailInfoController = [[IPCellDetailInfo alloc]init];
    IPCellDetailInfoController.ClipDetialsInterfaceUrl=it.ClipDetialsInterfaceUrl;
    IPCellDetailInfoController.ClipDetialsTitle = it.Primary_Name;
    IPCellDetailInfoController.btnPlayOrViewTitle = it.Sndlvl_Desc;
　　
    [self.navigationController pushViewController:IPCellDetailInfoController animated:YES]; //新視圖壓入到棧中
    [IPCellDetailInfoController release];
    
    NSLog(@"row = [%d], col = [%d], Preview_Url = [%@]", row, index,preview_Url);
    [preview_Url release];
}
@end

好了  其實主要就是要會使用UITapGestureRecognizer，當然這只是手勢的其中一個。下面還有幾個如：

• UITapGestureRecognizer
• UIPinchGestureRecognizer
• UIRotationGestureRecognizer
• UISwipeGestureRecognizer
• UIPanGestureRecognizer
• UILongPressGestureRecognizer

從命名上不難了解這些類別所對應代表的手勢，分別是 Tap（點一下）、Pinch（二指往內或往外撥動）、Rotation（旋轉）、Swipe（滑動，快速移動）、Pan （拖移，慢速移動）以及 LongPress（長按）。