cocoa-touch - 在 ImageView 之间暂停

Question

我想运行一系列带有对话泡泡的图片(比如脱衣舞卡通)。我尝试使用该操作:

-(IBAction) runDialog:(id)sender {
    imageView.image = [UIImage imageNamed:@"a1.png"];
    [NSThread sleepForTimeInterval:5.0];
    imageView.image = [UIImage imageNamed:@"b1.png"];
    [NSThread sleepForTimeInterval:5.0];
    imageView.image = [UIImage imageNamed:@"b2.png"];
    [NSThread sleepForTimeInterval:5.0];
    imageView.image = [UIImage imageNamed:@"a2.png"];
    [NSThread sleepForTimeInterval:5.0];
}

这行不通。它所做的只是在大约 20 秒后显示最后一张图像 (a2.png)我应该如何解决这个问题:显示一系列中间有停顿的图片？

Answer 1

改用 NSTimer。

- (IBAction)runDialog:(id)sender {
    yourInstanceVariableOfNSTimer = [NSTimer scheduledTimerWithTimeInterval:5.0f
        target:self selector:@selector(showNextPage) userInfo:nil repeats:NO];
}
- (void)showNextPage {
    imageView.image = [yourInstanceVariableOfNSArray 
                            objectAtIndex:++yourInstanceVariableOfNSInteger];
    if (!transitionsFinished) {
        yourInstanceVariableOfNSTimer = [NSTimer scheduledTimerWithTimeInterval:5.0f
            target:self selector:@selector(showNextPage) userInfo:nil repeats:NO];
    }
}