objective-c - iOS， View 之间的转换

Question

在下面的代码中

- (IBAction)showAbout:(id)sender {
    AboutView *a = [[AboutView alloc] initWithNibName:@"AboutView" bundle:nil];

    [self setAboutView:a];

    [UIView setAnimationDuration:.75]; 
    [[self aboutView] setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];

    [self presentModalViewController:[self aboutView] animated:YES];
}

这两行似乎什么也没做。

    [UIView setAnimationDuration:.75]; 
    [[self aboutView] setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];

在这个例子中，我用错了吗？

Answer 1

您不能设置标准过渡的持续时间。