标签： 模拟手势，UITouch，UIEvent

1.拓展UITouch类和UIEvent类（通过category），具体见附件TouchSynthesis.h和TouchSynthesis.m

2.在需要的类中，定义UITouch和UIEvent类的对象。

UITouch *touch = [[UITouchalloc] initWithPoint:point andView:mapview];

     UIEvent *eventDown = [[UIEventalloc] initWithTouch:touch];

[touch.view touchesBegan:[eventDownallTouches]  withEvent:eventDown];

[touch setPhase:UITouchPhaseEnded];

    UIEvent *eventUp = [[UIEventalloc] initWithTouch:touch];

    [touch.view touchesEnded:[eventUp allTouches] withEvent:eventUp];

    [eventDown release];

    [eventUp release];

     [touch release];

TouchSynthesis.h文件

#import <UIKit/UIKit.h>

@interface UITouch (Synthesize)

– (id)initInView:(UIView *)view;
-(id) initdoubletap:(UIView *)view;
– (id)initWithPoint:(CGPoint)point andView:(UIView*)view;
– (void)setPhase:(UITouchPhase)phase;
– (void)setLocationInWindow:(CGPoint)location;

@end

@interface UIEvent (Synthesize)

– (id)initWithTouch:(UITouch *)touch;

@end

TouchSynthesis.m文件

#import “TouchSynthesis.h”
#import “MyUITouch.h”

@implementation UITouch (Synthesize)

//
// initInView:phase:
//
// Creats a UITouch, centered on the specified view, in the view’s window.
// Sets the phase as specified.
//
– (id)initInView:(UIView *)view
{
NSLog(@”init in view”);
self = [super init];
if (self != nil)
{
CGRect frameInWindow;
if ([view isKindOfClass:[UIWindow class]])
{
frameInWindow = view.frame;
}
else
{
frameInWindow =
[view.window convertRect:view.frame fromView:view.superview];
}

_tapCount = 1;
_locationInWindow =
CGPointMake(
frameInWindow.origin.x + 0.5 * frameInWindow.size.width,
frameInWindow.origin.y + 0.5 * frameInWindow.size.height);
_previousLocationInWindow = _locationInWindow;

UIView *target = [view.window hitTest:_locationInWindow withEvent:nil];

_window = [view.window retain];
_view = [target retain];
_phase = UITouchPhaseBegan;
_touchFlags._firstTouchForView = 1;
_touchFlags._isTap = 1;
_timestamp = [NSDate timeIntervalSinceReferenceDate];
}
return self;
}
– (id)initdoubletap:(UIView *)view
{
NSLog(@”init in view”);
self = [super init];
if (self != nil)
{
CGRect frameInWindow;
if ([view isKindOfClass:[UIWindow class]])
{
frameInWindow = view.frame;
}
else
{
frameInWindow =
[view.window convertRect:view.frame fromView:view.superview];
}

_tapCount = 2;
_locationInWindow =
CGPointMake(
frameInWindow.origin.x + 0.5 * frameInWindow.size.width,
frameInWindow.origin.y + 0.5 * frameInWindow.size.height);
_previousLocationInWindow = _locationInWindow;

UIView *target = [view.window hitTest:_locationInWindow withEvent:nil];

_window = [view.window retain];
_view = [target retain];
_phase = UITouchPhaseBegan;
_touchFlags._firstTouchForView = 1;
_touchFlags._isTap = 1;
_timestamp = [NSDate timeIntervalSinceReferenceDate];
}
return self;
}

– (id)initWithPoint:(CGPoint)point andView:(UIView*)view
{
self = [super init];
if (self != nil)
{
CGRect frameInWindow;
if ([view isKindOfClass:[UIWindow class]])
{
frameInWindow = view.frame;
}
else
{
frameInWindow =
[view.window convertRect:view.frame fromView:view.superview];
}

_tapCount = 1;
_locationInWindow = point;
_previousLocationInWindow = _locationInWindow;
UIView *target = [view.window hitTest:_locationInWindow withEvent:nil];
_view = [target retain];
_window = [view.window retain];
_phase = UITouchPhaseBegan;
_touchFlags._firstTouchForView = 1;
_touchFlags._isTap = 1;
_timestamp = [NSDate timeIntervalSinceReferenceDate];
}
return self;
}
//
// setPhase:
//
// Setter to allow access to the _phase member.
//
– (void)setPhase:(UITouchPhase)phase
{
_phase = phase;
_timestamp = [NSDate timeIntervalSinceReferenceDate];
}

//
// setPhase:
//
// Setter to allow access to the _locationInWindow member.
//
– (void)setLocationInWindow:(CGPoint)location
{
_previousLocationInWindow = _locationInWindow;
_locationInWindow = location;
_timestamp = [NSDate timeIntervalSinceReferenceDate];
}

@end

//
// GSEvent is an undeclared object. We don’t need to use it ourselves but some
// Apple APIs (UIScrollView in particular) require the x and y fields to be present.
//
@interface GSEventProxy : NSObject
{
@public
unsigned int flags;
unsigned int type;
unsigned int ignored1;
float x1;
float y1;
float x2;
float y2;
unsigned int ignored2[10];
unsigned int ignored3[7];
float sizeX;
float sizeY;
float x3;
float y3;
unsigned int ignored4[3];
}
@end
@implementation GSEventProxy
@end

//
// PublicEvent
//
// A dummy class used to gain access to UIEvent’s private member variables.
// If UIEvent changes at all, this will break.
//
@interface PublicEvent : NSObject
{
@public
GSEventProxy           *_event;
NSTimeInterval          _timestamp;
NSMutableSet           *_touches;
CFMutableDictionaryRef  _keyedTouches;
}
@end

@implementation PublicEvent
@end

@interface UIEvent (Creation)

– (id)_initWithEvent:(GSEventProxy *)fp8 touches:(id)fp12;

@end

//
// UIEvent (Synthesize)
//
// A category to allow creation of a touch event.
//
@implementation UIEvent (Synthesize)

– (id)initWithTouch:(UITouch *)touch
{
CGPoint location = [touch locationInView:touch.window];
GSEventProxy *gsEventProxy = [[GSEventProxy alloc] init];
gsEventProxy->x1 = location.x;
gsEventProxy->y1 = location.y;
gsEventProxy->x2 = location.x;
gsEventProxy->y2 = location.y;
gsEventProxy->x3 = location.x;
gsEventProxy->y3 = location.y;
gsEventProxy->sizeX = 1.0;
gsEventProxy->sizeY = 1.0;
gsEventProxy->flags = ([touch phase] == UITouchPhaseEnded) ? 0x1010180 : 0x3010180;
gsEventProxy->type = 3001;

//
// On SDK versions 3.0 and greater, we need to reallocate as a
// UITouchesEvent.
//
Class touchesEventClass = objc_getClass(“UITouchesEvent”);
if (touchesEventClass && ![[self class] isEqual:touchesEventClass])
{
[self release];
self = [touchesEventClass alloc];
}

self = [self _initWithEvent:gsEventProxy touches:[NSSet setWithObject:touch]];
if (self != nil)
{
}
return self;
}

@end

MyUITouch.h文件
#import <Foundation/Foundation.h>

#ifdef __IPHONE_6_0
@interface UITouch () {
NSTimeInterval _timestamp;
UITouchPhase _phase;
UITouchPhase _savedPhase;
NSUInteger _tapCount;

UIWindow *_window;
UIView *_view;
UIView *_gestureView;
UIView *_warpedIntoView;
NSMutableArray *_gestureRecognizers;
NSMutableArray *_forwardingRecord;

CGPoint _locationInWindow;
CGPoint _previousLocationInWindow;
UInt8 _pathIndex;
UInt8 _pathIdentity;
float _pathMajorRadius;
struct {
unsigned int _firstTouchForView:1;
unsigned int _isTap:1;
unsigned int _isDelayed:1;
unsigned int _sentTouchesEnded:1;
unsigned int _abandonForwardingRecord:1;
} _touchFlags;
}
@end
#endif