我怎样才能使这个片段更漂亮/更好/更少的线条？

Question

我一直在尝试最小化应用程序中的所有功能，但无法真正找到如何使该功能更好，也许有人在这方面比我更好？ :)

-(void)showRivBoxWithAnimtation:(BOOL)yesno {
    if(yesno) {
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:0.2];
        if ([self alpha] > 0) { 
            [self setAlpha:0.0];
            [appDelegate.JSONparser setDelegate:self.delegate]; //Give back the JSONparser to the parent!
        } else {
            [self setAlpha:1.0];
        }
        [UIView setAnimationDelegate:self];
        [UIView setAnimationDidStopSelector:@selector(clearRivBoxContent:finished:context:)];
        [UIView commitAnimations];
    } else {
        if ([self alpha] > 0) { 
            [self setAlpha:0.0];
            [appDelegate.JSONparser setDelegate:self.delegate]; //Give back the JSONparser to the parent!
        } else {
            [self setAlpha:1.0];
        }
    }
}

Answer 1

这就是我要做的：

-(void)showRivBoxWithAnimtation:(BOOL)yesno {
    [UIView animateWithDuration:yesno ? 0.2 : 0.0
                     animations:^{
        if ([self alpha] > 0) { 
            [self setAlpha:0.0];
            [appDelegate.JSONparser setDelegate:self.delegate]; //Give back the JSONparser to the parent!
        } else {
            [self setAlpha:1.0];
        }
        }
                    completion:^(BOOL finished){
        if (finished) {
            // Do the stuff from clearRivBoxContent:finished:context:
        }
    }];
}

Answer 2

除非操作顺序。阿尔法至关重要；这可能是可以制作的最小的了。

-(void)showRivBoxWithAnimtation:(BOOL)yesno {
  if ([self alpha] > 0) { 
    [self setAlpha:0.0];
    [appDelegate.JSONparser setDelegate:self.delegate]; //Give back the JSONparser to the parent!
  } else {
    [self setAlpha:1.0];
  }

  if(yesno) {
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.2];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDidStopSelector:@selector(clearRivBoxContent:finished:context:)];
    [UIView commitAnimations];
  }
}