Question

您好我是iOS的初学者，我有一个问题。

我想在更改方向时重新排列多个按钮，所以我有这个代码来创建它们：

NSArray *buttonImages = [[NSArray alloc] initWithObjects:@"button_1.png",@"button_2.png",
    @"button_3.png", @"button_4.png", nil];




 int xcord = 0;
 //int ycord = 0;

 UIInterfaceOrientation destOrientation = self.interfaceOrientation;

 if (destOrientation == UIInterfaceOrientationPortrait || destOrientation == UIInterfaceOrientationPortraitUpsideDown) {

  screenWidth = 768;
 } else {

  screenWidth = 1024;
 }


 int buttonWidth = 57;
 int buttonHeight = 86;
 int screenHorizontalDivisions = screenWidth / 5;

 for (int i=0; i<4; i++) {


  int buttonStartingOffset = screenHorizontalDivisions - buttonWidth / 2;

   btn = [[DashButton alloc] initWithFrame:CGRectMake(buttonStartingOffset + xcord, 40, buttonWidth,buttonHeight) andImage:[buttonImages objectAtIndex:i] andTitle:@"Test"];
  btn.tag = i+1;
  [springboardScrollView addSubview:btn];
  //[btn release];

  xcord = xcord + screenHorizontalDivisions;

 }

以及重新安排它们的代码是：

- (void)animate: (id)sender {


 UIButton *button = (UIButton *)sender;

 UIInterfaceOrientation destOrientation = self.interfaceOrientation;

 if (destOrientation == UIInterfaceOrientationPortrait || destOrientation == UIInterfaceOrientationPortraitUpsideDown) {

  screenWidth = 768;
 } else {

  screenWidth = 1024;
 }

 int xcord = 0;
 int buttonWidth = 57;
 int buttonHeight = 86;
 int screenHorizontalDivisions = screenWidth / 5; //find the divisions
 int buttonStartingOffset = screenHorizontalDivisions - buttonWidth / 2; //center the button

 NSLog (@"%i", button.tag);

 switch (button.tag) {
  case 1:
   button.frame = CGRectMake(buttonStartingOffset, 40, buttonWidth,buttonHeight);
   break;
  case 2:
   button.frame = CGRectMake(buttonStartingOffset + screenHorizontalDivisions, 40, buttonWidth,buttonHeight);
   break;
  case 3:
   button.frame = CGRectMake(buttonStartingOffset + screenHorizontalDivisions * 2, 40, buttonWidth,buttonHeight);
   break;
  case 4:
   button.frame = CGRectMake(buttonStartingOffset + screenHorizontalDivisions * 3, 40, buttonWidth,buttonHeight);
   break;

 }

然后我在方向改变时调用它：

- (void)willAnimateSecondHalfOfRotationFromInterfaceOrientation: (UIInterfaceOrientation) fromInterfaceOrientation duration: (NSTimeInterval) duration {


 [self animate:btn];

我如何逐个参考每个按钮？动画中的代码：始终返回button.tag = 4。

请协助!!

由于比尔。

Answer 1

您需要使用以下代码获取UIButtons数组：

NSArray* buttons = [springboardScrollView subviews]

这将返回scrollView中的所有子视图。如果你只有UiButtons那将是滚动视图中的所有按钮。如果在滚动视图中有其他类型的视图，则需要遍历数组并检查对象是否为UiButton，这在以下link中有说明。然后你可以改变框架，图像，位置....

为多个UIButton设置动画

1 个答案: