我正在制作一个iPad项目，其中一个名为“Car”的类（这是一个与视图控制器不同的文件）应该被拖到主视图周围。
我按照我在Apple示例中看到的那样设置了类，当我运行应用程序时，我能够查看我的图像，但是就像我的课程没有响应我的触摸事件而我无法解决问题。
这是我的班级代码： Car.h
#import <UIKit/UIKit.h>
@interface Car : UIView {
UIImageView *firstPieceView;
CGPoint startTouchPosition;
}
-(void)animateFirstTouchAtPoint:(CGPoint)touchPoint forView:(UIImageView *)theView;
-(void)animateView:(UIView *)theView toPosition:(CGPoint) thePosition;
-(void)dispatchFirstTouchAtPoint:(CGPoint)touchPoint forEvent:(UIEvent *)event;
-(void)dispatchTouchEvent:(UIView *)theView toPosition:(CGPoint)position;
-(void)dispatchTouchEndEvent:(UIView *)theView toPosition:(CGPoint)position;
@property (nonatomic, retain) IBOutlet UIImageView *firstPieceView;
@end
这是我的其他类代码：Car.m
#import "Car.h"
@implementation Car
@synthesize firstPieceView;
#define GROW_ANIMATION_DURATION_SECONDS 0.15 // Determines how fast a piece size grows when it is moved.
#define SHRINK_ANIMATION_DURATION_SECONDS 0.15 // Determines how fast a piece size shrinks when a piece stops moving.
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
// Enumerate through all the touch objects.
NSUInteger touchCount = 0;
for (UITouch *touch in touches) {
// Send to the dispatch method, which will make sure the appropriate subview is acted upon
[self dispatchFirstTouchAtPoint:[touch locationInView:self] forEvent:nil];
touchCount++;
}
}
// Checks to see which view, or views, the point is in and then calls a method to perform the opening animation,
// which makes the piece slightly larger, as if it is being picked up by the user.
-(void)dispatchFirstTouchAtPoint:(CGPoint)touchPoint forEvent:(UIEvent *)event
{
if (CGRectContainsPoint([firstPieceView frame], touchPoint)) {
[self animateFirstTouchAtPoint:touchPoint forView:firstPieceView];
}
}
// Handles the continuation of a touch.
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
NSUInteger touchCount = 0;
// Enumerates through all touch objects
for (UITouch *touch in touches) {
// Send to the dispatch method, which will make sure the appropriate subview is acted upon
[self dispatchTouchEvent:[touch view] toPosition:[touch locationInView:self]];
touchCount++;
}
}
// Checks to see which view, or views, the point is in and then sets the center of each moved view to the new postion.
// If views are directly on top of each other, they move together.
-(void)dispatchTouchEvent:(UIView *)theView toPosition:(CGPoint)position
{
// Check to see which view, or views, the point is in and then move to that position.
if (CGRectContainsPoint([firstPieceView frame], position)) {
firstPieceView.center = position;
}
}
// Handles the end of a touch event.
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
// Enumerates through all touch object
for (UITouch *touch in touches) {
// Sends to the dispatch method, which will make sure the appropriate subview is acted upon
[self dispatchTouchEndEvent:[touch view] toPosition:[touch locationInView:self]];
}
}
// Checks to see which view, or views, the point is in and then calls a method to perform the closing animation,
// which is to return the piece to its original size, as if it is being put down by the user.
-(void)dispatchTouchEndEvent:(UIView *)theView toPosition:(CGPoint)position
{
// Check to see which view, or views, the point is in and then animate to that position.
if (CGRectContainsPoint([firstPieceView frame], position)) {
[self animateView:firstPieceView toPosition: position];
}
}
-(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
// Enumerates through all touch object
for (UITouch *touch in touches) {
// Sends to the dispatch method, which will make sure the appropriate subview is acted upon
[self dispatchTouchEndEvent:[touch view] toPosition:[touch locationInView:self]];
}
}
#pragma mark -
#pragma mark === Animating subviews ===
#pragma mark
// Scales up a view slightly which makes the piece slightly larger, as if it is being picked up by the user.
-(void)animateFirstTouchAtPoint:(CGPoint)touchPoint forView:(UIImageView *)theView
{
// Pulse the view by scaling up, then move the view to under the finger.
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:GROW_ANIMATION_DURATION_SECONDS];
theView.transform = CGAffineTransformMakeScale(1.2, 1.2);
[UIView commitAnimations];
}
// Scales down the view and moves it to the new position.
-(void)animateView:(UIView *)theView toPosition:(CGPoint)thePosition
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:SHRINK_ANIMATION_DURATION_SECONDS];
// Set the center to the final postion
theView.center = thePosition;
// Set the transform back to the identity, thus undoing the previous scaling effect.
theView.transform = CGAffineTransformIdentity;
[UIView commitAnimations];
}
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
UIImage *img = [ UIImage imageNamed: @"CyanSquare.png" ];
firstPieceView = [[UIImageView alloc] initWithImage: img];
//[img release];
[super addSubview:firstPieceView];
[firstPieceView release];
}
return self;
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
// Drawing code
}
*/
- (void)dealloc
{
[firstPieceView release];
[super dealloc];
}
@end
这是我的视图控制器代码：（ParkingviewController.h）
#import <UIKit/UIKit.h>
#import "Car.h"
@interface ParkingViewController : UIViewController {
}
@end
最后但并非最不重要的是ParkingViewController.m
#import "ParkingViewController.h"
@implementation ParkingViewController
- (void)dealloc
{
[super dealloc];
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
Car *car1 = [[Car alloc] init];
[self.view addSubview:car1];
[car1 release];
[super viewDidLoad];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return YES;
}
@end
如果我发布了所有代码，请原谅我，但我想清楚我项目的各个方面，以便任何人都可以清楚地了解整个情况。
答案 0 :(得分：1)
您需要为正在为要处理的触摸创建的Car对象设置一个框架。您可以看到图像，因为默认情况下，视图的clipsToBounds属性设置为NO。