Teach a problem! About multiple label display problems (also arguably animation?)

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For example
{
label1.hidden = NO;
. . . . . .
label2.hidden = NO;
. . . . . .
label3.hidden = NO;
. . . . . .
label4.hidden = NO;
. . . . .
label5.hidden = NO;
. . . . . . .
}


Program has multiple label, label.hidden = NO; intermediate operations other blocking operation (an interval certainly more than four seconds or more, to the naked eye to distinguish it should be displayed one by one), I want them to appear one by one how to do ?
Currently they are to finish out the method together,




It was prompted by kvo afternoon ~ ~ try to do it, or last out together.
Reply:
nstimer ah, set the time interval, one a display! ! !
Do not know if you mean this. Hey!
Reply:
Of all to you! Before the code block used to solve - but to tell you the same! ! !