问题
I am using auto layout with UIScrollView.
Main UIView Height = 1300
ContentView (within UIScrollBar) UIView = 1100
The ConetntView contains a button at the bottom. It is completely visible but when I click it, it does not work.
Constraints are :
1) ScrollView leading, trailing, top & bottom with main UIView
2) ContantView leading, trailing, top & bottom with UIScrollView
3) Equal height constraint between ContentView & main UIView
Please help.
回答1:
So, according to your comment this is layout issue. I think root cause is 3rd constraint. Please remove it and create another constraint for Content View Height with hardcoded height value (like 'Height - (1315) - Content View'). If you need to have flexible height for Content View, i.e. not hardcoded in the Storyboard, then please modify it programmatically.
回答2:
I had to provide (-)ve value for bottom space of the ContentView from the superview. It did the job. Initially it was set to zero and because of this there was a large extra space below the bottom and it made the scrolling larger that was not desired.
I have tested it in all the simulators - 4s to 6+ and it is working fine.
Thanks to Nikolay for his continuous help.
Also as I am completely new to iPhone development so I do not know whether my workaround is correct or not. So if there is another solution to the problem then please let me know.
来源：https://stackoverflow.com/questions/27820304/uibutton-is-not-working-clickable-in-uiscrollview