201 lines
7.8 KiB
Plaintext
201 lines
7.8 KiB
Plaintext
#import <UIKit/UIKit.h>
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#import <objc/runtime.h>
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#import <QuartzCore/QuartzCore.h>
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extern UIView *UnityGetGLView(void);
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@interface UIApplication (UnityTouchHook)
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- (void)ut_sendEvent:(UIEvent *)event;
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@end
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@implementation UIApplication (UnityTouchHook)
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// ==========================================
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// 【实装优化】：将 Ivar、Class 提取为静态全局变量，在 +load 中一次性缓存
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static CFTimeInterval g_lastMovedTime = 0;
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static Class g_touchClass = Nil;
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static Ivar g_ivarView = NULL;
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static Ivar g_ivarLocation = NULL;
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static Ivar g_ivarPrevLocation = NULL;
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// ==========================================
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+ (void)load
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{
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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Class cls = [UIApplication class];
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Method original = class_getInstanceMethod(cls, @selector(sendEvent:));
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Method swizzled = class_getInstanceMethod(cls, @selector(ut_sendEvent:));
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if (original && swizzled) {
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method_exchangeImplementations(original, swizzled);
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}
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// ==========================================
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// 【实装优化】：在 +load 时集中初始化，彻底消灭每帧的 Runtime 检索开销
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g_touchClass = [UITouch class];
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g_ivarView = class_getInstanceVariable(g_touchClass, "_view");
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g_ivarLocation = class_getInstanceVariable(g_touchClass, "_locationInWindow");
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g_ivarPrevLocation = class_getInstanceVariable(g_touchClass, "_previousLocationInWindow");
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// ==========================================
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});
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}
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- (void)ut_sendEvent:(UIEvent *)event
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{
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// 1. 让系统和 WebView 先走正常响应
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[self ut_sendEvent:event];
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if (event.type != UIEventTypeTouches)
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return;
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UIView *unityView = UnityGetGLView();
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if (!unityView)
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return;
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NSSet *touches = event.allTouches;
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UITouch *touch = [touches anyObject];
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if (!touch)
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return;
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// 2. 拦截所有来自 WebView 或非 UnityView 的点击
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if (touch.view != unityView && ![touch.view isDescendantOfView:unityView]) {
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UITouchPhase phase = touch.phase;
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if (phase == UITouchPhaseMoved) {
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CFTimeInterval currentTime = CACurrentMediaTime();
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if (currentTime - g_lastMovedTime < 0.016) {
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return;
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}
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g_lastMovedTime = currentTime;
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}
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// 【优化成果】：直接使用 self 获取 keyWindow
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UIWindow *window = self.keyWindow;
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if (!window && unityView.window) {
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window = unityView.window;
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}
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// ==========================================
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// 【实装优化】：window == nil 时提前返回，防止后续无意义计算与 KVC 崩溃风险
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if (!window) {
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return;
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}
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// ==========================================
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// 【优化成果】：提取 locationInView 只计算一次
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CGPoint pointInWindow = [touch locationInView:window];
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CGPoint pointPrevWindow = [touch previousLocationInView:window];
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CGPoint originalLocationStruct = pointInWindow;
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CGPoint originalPrevLocationStruct = pointPrevWindow;
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// 【优化成果】：砍掉 convertPoint:fromView: 的矩阵计算
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CGPoint pointInUnity = pointInWindow;
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CGRect unityFrame = unityView.frame;
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if (unityFrame.origin.x != 0 || unityFrame.origin.y != 0) {
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pointInUnity.x -= unityFrame.origin.x;
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pointInUnity.y -= unityFrame.origin.y;
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}
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// 【优化安全加固】：保留最后一道防线，防御极端情况下的 NaN / Inf
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if (isnan(pointInUnity.x) || isinf(pointInUnity.x)) pointInUnity.x = 0;
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if (isnan(pointInUnity.y) || isinf(pointInUnity.y)) pointInUnity.y = 0;
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// 【优化成果】：在栈上缓存一次 bounds 结构体
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CGRect bounds = unityView.bounds;
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CGFloat viewWidth = bounds.size.width <= 0 ? 375 : bounds.size.width;
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CGFloat viewHeight = bounds.size.height <= 0 ? 812 : bounds.size.height;
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// 【优化成果】：改用利于 CPU 分支预测的 if-else 约束范围
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if (pointInUnity.x < 0) {
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pointInUnity.x = 0;
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} else if (pointInUnity.x > viewWidth) {
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pointInUnity.x = viewWidth;
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}
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if (pointInUnity.y < 0) {
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pointInUnity.y = 0;
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} else if (pointInUnity.y > viewHeight) {
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pointInUnity.y = viewHeight;
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}
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CGPoint finalInjectPoint = pointInUnity;
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// 3. 备份原始值（后续无需重复获取 Ivar，直接使用静态全局变量）
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UIView *originalView = touch.view;
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NSValue *originalLocation = nil;
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NSValue *originalPrevLocation = nil;
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if (g_ivarLocation) {
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originalLocation = [touch valueForKey:@"locationInWindow"];
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}
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if (g_ivarPrevLocation) {
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originalPrevLocation = [touch valueForKey:@"previousLocationInWindow"];
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}
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// 4. 【强制临时修改】重写原生 touch
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if (g_ivarView) {
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object_setIvar(touch, g_ivarView, unityView);
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} else {
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[touch setValue:unityView forKey:@"view"];
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}
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if (g_ivarLocation) object_setIvar(touch, g_ivarLocation, [NSValue valueWithCGPoint:finalInjectPoint]);
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// 计算 Moved 阶段的伪造历史坐标
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if (phase == UITouchPhaseMoved && originalLocation && originalPrevLocation) {
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CGPoint offset = CGPointMake(originalLocationStruct.x - originalPrevLocationStruct.x, originalLocationStruct.y - originalPrevLocationStruct.y);
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CGPoint fakePrevPoint = CGPointMake(finalInjectPoint.x - offset.x, finalInjectPoint.y - offset.y);
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if (isnan(fakePrevPoint.x) || isinf(fakePrevPoint.x)) fakePrevPoint.x = finalInjectPoint.x;
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if (isnan(fakePrevPoint.y) || isinf(fakePrevPoint.y)) fakePrevPoint.y = finalInjectPoint.y;
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if (fakePrevPoint.x < 0) {
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fakePrevPoint.x = 0;
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} else if (fakePrevPoint.x > viewWidth) {
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fakePrevPoint.x = viewWidth;
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}
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if (fakePrevPoint.y < 0) {
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fakePrevPoint.y = 0;
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} else if (fakePrevPoint.y > viewHeight) {
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fakePrevPoint.y = viewHeight;
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}
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if (g_ivarPrevLocation) object_setIvar(touch, g_ivarPrevLocation, [NSValue valueWithCGPoint:fakePrevPoint]);
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} else {
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if (g_ivarPrevLocation) object_setIvar(touch, g_ivarPrevLocation, [NSValue valueWithCGPoint:finalInjectPoint]);
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}
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[touch setValue:[NSValue valueWithCGPoint:finalInjectPoint] forKey:@"locationInWindow"];
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// 5. 将清洗干净的事件丢给 UnityView 通道
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switch (phase) {
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case UITouchPhaseBegan: [unityView touchesBegan:touches withEvent:event]; break;
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case UITouchPhaseMoved: [unityView touchesMoved:touches withEvent:event]; break;
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case UITouchPhaseEnded: [unityView touchesEnded:touches withEvent:event]; break;
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case UITouchPhaseCancelled: [unityView touchesCancelled:touches withEvent:event]; break;
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default: break;
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}
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// 6. 立刻恢复现场
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if (g_ivarView) {
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object_setIvar(touch, g_ivarView, originalView);
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} else {
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[touch setValue:originalView forKey:@"view"];
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}
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if (g_ivarLocation && originalLocation) {
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object_setIvar(touch, g_ivarLocation, originalLocation);
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[touch setValue:originalLocation forKey:@"locationInWindow"];
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}
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if (g_ivarPrevLocation && originalPrevLocation) {
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object_setIvar(touch, g_ivarPrevLocation, originalPrevLocation);
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}
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}
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}
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@end
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