如何以编程方式调整按钮动画的大小

Question

我是 Objective-C 的新手。我创建了一个向上移动 3 个按钮的动画。这些按钮包含图像。但是，当此按钮动画发生时，它会调整按钮图像的大小并使它们变得巨大。我试图更正下面的代码以调整按钮图像的大小，但我仍然得到巨大的按钮。有人可以帮帮我吗？它应该是宽度：78 高度：76。我尝试替换宽度和高度，但它仍然不起作用。注意：只需更正代码，我不需要完全不同的答案。

-(IBAction)Search:(id)sender {

CGFloat screenWidth = self.view.bounds.size.width;
CGFloat screenHeight = self.view.bounds.size.height;

CGFloat normalizedX = (124 / 320); // You calculate these 'normalized' numbers, possibly from a designer's spec.
// it's the percent the amount should be over, as number from 0-1.
// This number is based on screen width of 320 having x 124 pt.

CGFloat startingX = normalizedX * screenWidth;
CGFloat startingY = (475 / 200) * screenHeight;
CGFloat width = (42 / 40) * screenWidth;
CGFloat height = (30 / 30) * screenHeight;

CGRect startingRect = CGRectMake(startingX, startingY, width, height);

self.button.frame = startingRect;
self.buttonTwo.frame = startingRect;
self.buttonThree.frame = startingRect;

// animate
[UIView animateWithDuration:0.75 animations:^{
    CGFloat firstX = (13 / 770) * screenWidth;
    CGFloat lowerY = (403 / 370) * screenHeight;
    self.button.frame = CGRectMake(firstX, lowerY, width, height);

    CGFloat secondX = (124 / 424) * screenWidth;
    CGFloat upperY = (347 / 447) * screenHeight;
    self.buttonTwo.frame = CGRectMake(secondX, upperY, width, height);

    CGFloat thirdX = (232 / 680) * screenWidth;
    self.buttonThree.frame = CGRectMake(thirdX, lowerY, width, height);
}];
 }

Answer 1

在我看来，您的高度和宽度数学是错误的。

(42/40) * screenWidth 将简化为 (1) * screenWidth，或屏幕的全宽（表达式42/40 将使用整数数学完成，结果为 1.0。如果它使用浮点数，你'会得到 1.05 * screenWidth，这会使图像更大。）

您的身高计算也有类似的问题。您正在将按钮设置为屏幕的全高，并且稍微宽一些。