问题
I am developing an application in cocoa.I need to hide a progress bar placed in an NSView and show an NSTextfield in that place .I used the following cod [progressbar setHidden:TRUE] [textfield setHidden:FALSE]; But this code snippet is not working. Is that a bug.??I used to hide the same code to hide certain other text fields in the same page .But that controls became hidden.looking for a solution...
回答1:
Are progressbar and textfield outlets ? If yes, make sure they are correctly connected in your nib. Also make sure that you call setHidden: from the main thread.
And unrelated to your problem, in Objective-C you should use YES instead of TRUE and NO instead of FALSE.
来源：https://stackoverflow.com/questions/1194888/sethidden-not-working