Question: Should I be using frame or constraints to draw views in iOS?
Answer: Constraints. Autolayout will be able to adjust to the four different screen sizes, so you don’t have to. It’s like the CSS of iOS.
Question: I know how to animate the background color of a UIView from black to red with animateWithDuration … What do I use when I want to make it go from black to blue to red?
Answer: I could use two animations with different durations, or key frame animations.
Question: One of the labs this week was making a game with four draggable images. After finishing the lab, I noticed that I could drag multiple images at a time and that they would collapse to one location at the end of the drag, because I had only accounted for one object. How can I make it so that the user can only drag one object at a time?
Answer: One solution I found online used one gesture recognizer in the superview and detected which object was pressed using hitTest:. However, this did not solve my problem. I could still take the two. This question is still open, but I can imagine a solution where I store the locations of a four objects in an array and update it as I change each object’s location.
Xida Zheng 