给控件添加单击事件－－UITapGestureRecognizer

在Iphone开发中，像UIimageView是不支持点击的，但往往我们却有很多能在Image上点击的需求，比如一个自定义的TableViewCell中放入三个UIimageView，在这里命名为imageleft，imagemiddle，imggeright，当tableView加载后，单击tableView中某一行中的image，我便进入该图片的详细页面。

当然，现在的最新版支持手势控件，只要拖一个这样的控件到UIImageView上，实现它的委托就可以了。若版本太低不支持这样的控件，你便只好老老实实的亲手写代码了。

+ View Code?

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#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;<br>... @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];     } } <br>#pragma mark -<br>#pragma mark TableGridViewCellDelegate<br>- (void) tapedImageViewInCell:(UITableViewCell*)cell withIndex:(int)index<br>{<br>    int row = [myTable indexPathForCell:cell].row;<br>    VODItem *it = (VODItem*)[ipListarry objectAtIndex:row*3+index];<br>    NSString *preview_Url = [[NSString alloc] initWithFormat:@"%@",it.Preview_Url];<br><br>    IPCellDetailInfo *IPCellDetailInfoController = [[IPCellDetailInfo alloc]init];<br>    IPCellDetailInfoController.ClipDetialsInterfaceUrl=it.ClipDetialsInterfaceUrl;<br>    IPCellDetailInfoController.ClipDetialsTitle = it.Primary_Name;<br>    IPCellDetailInfoController.btnPlayOrViewTitle = it.Sndlvl_Desc;<br>　　<br>    [self.navigationController pushViewController:IPCellDetailInfoController animated:YES]; //新视图压入到栈中<br>    [IPCellDetailInfoController release];<br>    <br>    NSLog(@"row = [%d], col = [%d], Preview_Url = [%@]", row, index,preview_Url);<br>    [preview_Url release];<br>} @end

好了  其实主要就是要会使用UITapGestureRecognizer，当然这只是手势的其中一个。下面还有几个如：

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

从命名上不难了解這些类別所对应代表的手势，分別是 Tap（点一下）、Pinch（二指往內或往外拨动）、Rotation（旋转）、Swipe（滑动，快速移动）、Pan （拖移，慢速移动）以及 LongPress（长按）。