You can't guard a value that doesn't exist yet

说明与用途

在 iOS 18.5 上的 WebDriverAgent 中，应用切换后执行拖拽手势会导致挂起并出现无限点错误。修复通过新方法立即解析坐标、验证并合成事件，消除了挂起并返回清晰的 400 错误。

问题

Drag gestures in WebDriverAgent hang and fail with an infinite-point assertion when the target app is busy after a switch.

结果

The new implementation removes the hang, provides a clear 400 error for invalid parameters, and aligns WDA’s drag behavior with W3C actions.

工作流

• 1. Resolve start and end coordinates immediately using screenPoint.
• 2. Validate that both points are finite; if not, return a 400 error with a clear message.
• 3. Map velocity to XCTest’s pixels-per-second values (default 500, slow 250, fast 750).
• 4. Build the touch event path: press, hold, drag, hold, lift.
• 5. Send the event directly to FBXCTestDaemonsProxy, bypassing XCTest’s snapshot and idle wait.
• 6. Wait up to animationCoolOffTimeout after the gesture, mirroring W3C actions.
• 7. Return success or a 400 error based on validation.
• 8. Update /wda/dragfromtoforduration and /wda/pressAndDragWithVelocity to use the new method.

证据

unknown error: Invalid parameter not satisfying: point.x != INFINITY && point.y != INFINITY

来源

Both endpoints called -[XCUICoordinate pressForDuration:thenDragToCoordinate:(withVelocity:thenHoldForDuration:)]

来源

A new -[XCUIApplication fb_pressAtCoordinate:forDuration:thenDragToCoordinate:withVelocity:thenHoldForDuration:error:]

来源