ios - UIView 动画立即发生

Question

我有一个包含三个按钮的动画，在我为按钮添加不同的可能位置之前，这些按钮可以正常工作。现在动画立即发生，但我不确定为什么。

这是一些代码:

defaults=[NSUserDefaults standardUserDefaults];
_btnCuenta3.hidden=NO;
CGPoint newPosition2;
CGPoint newPosition3;
CGPoint newPositionAgregar;
if([defaults objectForKey:@"cuenta3"]){
    newPosition2=CGPointMake(200.0f + _btnCuenta2.frame.size.width/2.0f, _btnCuenta2.center.y);
    newPosition3=CGPointMake(165.0f + _btnCuenta3.frame.size.width/2.0f, _btnCuenta3.center.y);
    newPositionAgregar=CGPointMake(130.0f + _btnAgregar.frame.size.width/2.0f, _btnAgregar.center.y);
    _btnCuenta2.center=newPosition2;
    _btnCuenta3.center=newPosition3;
    _btnAgregar.center=newPositionAgregar;
}else if([defaults objectForKey:@"cuenta2"]){
    newPosition2=CGPointMake(200.0f + _btnCuenta2.frame.size.width/2.0f, _btnCuenta2.center.y);
    newPositionAgregar=CGPointMake(165.0f + _btnAgregar.frame.size.width/2.0f, _btnAgregar.center.y);
    _btnCuenta2.center=newPosition2;
    _btnAgregar.center=newPositionAgregar;
}else{
    newPositionAgregar=CGPointMake(200.0f + _btnAgregar.frame.size.width/2.0f, _btnAgregar.center.y);
    _btnAgregar.center=newPositionAgregar;
}
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1.0f];
[UIView commitAnimations];

知道为什么会发生这种情况或我该如何解决它吗？

Answer 1

因为您没有制作任何动画。您只是在更改立即发生的属性。做这样的事情

[UIView animateWithDuration:1.0 animations:^{
        if([defaults objectForKey:@"cuenta3"]){
    newPosition2=CGPointMake(200.0f + _btnCuenta2.frame.size.width/2.0f, _btnCuenta2.center.y);
    newPosition3=CGPointMake(165.0f + _btnCuenta3.frame.size.width/2.0f, _btnCuenta3.center.y);
    newPositionAgregar=CGPointMake(130.0f + _btnAgregar.frame.size.width/2.0f, _btnAgregar.center.y);
    _btnCuenta2.center=newPosition2;
    _btnCuenta3.center=newPosition3;
    _btnAgregar.center=newPositionAgregar;
}else if([defaults objectForKey:@"cuenta2"]){
    newPosition2=CGPointMake(200.0f + _btnCuenta2.frame.size.width/2.0f, _btnCuenta2.center.y);
    newPositionAgregar=CGPointMake(165.0f + _btnAgregar.frame.size.width/2.0f, _btnAgregar.center.y);
    _btnCuenta2.center=newPosition2;
    _btnAgregar.center=newPositionAgregar;
}else{
    newPositionAgregar=CGPointMake(200.0f + _btnAgregar.frame.size.width/2.0f, _btnAgregar.center.y);
    _btnAgregar.center=newPositionAgregar;
}

}];