问题
I use method dragFromToForDuration to test my app on iPad. This method intends to tap and hold then drag an image to another location on the iPad's screen. I define exactly location of both the image and the targeted area. However, implementing this method generates an error:
target.dragFromToForDuration({x:startCoord.x, y:startCoord.y}, {x:finishCoord.x, y:finishCoord.y}, {duration:3});
[_NSCFDictionary doubleValue] : unrecognized selector sent to instance 0x1f83e5d0
Update: If I remove the word "duration" and the code became: target.dragFromToForDuration({x:startCoord.x, y:startCoord.y}, {x:finishCoord.x, y:finishCoord.y}, 3);
With this changing, xcode does not generate any error/warning and go through it without any action on the screen. Anyone encountered this problem?
回答1:
This function works well after modifying the startPoint and endPoint of target. I did not see this fault but my fellow did. :)
来源：https://stackoverflow.com/questions/19803701/error-xcode-4-6-3-method-dragfromtoforduration-does-not-work-at-all