嵌套动画块导致“分段错误”
我尝试使用以下代码一张接一张地显示三个图像：
image_1.alpha = 0.0;
image_2.alpha = 0.0;
image_3.alpha = 0.0;
[UIView animateWithDuration:0.25
animations:^{
image_1.alpha = 1.0;
} completion:^(BOOL finished) {
[UIView animateWithDuration:0.25
animations:^{
image_2.alpha = 1.0;
} completion:^(BOOL finished) {
[UIView animateWithDuration:0.25
animations:^{
image_3.alpha = 1.0;
} completion:^(BOOL finished) {
;
}];
}];
}];
给出： 内部编译器错误：分段错误
如果嵌套包含两个动画块，则不会出现错误。嵌套动画块是否不允许或有一些限制？
I try to show three images, one after one, with the following code:
image_1.alpha = 0.0;
image_2.alpha = 0.0;
image_3.alpha = 0.0;
[UIView animateWithDuration:0.25
animations:^{
image_1.alpha = 1.0;
} completion:^(BOOL finished) {
[UIView animateWithDuration:0.25
animations:^{
image_2.alpha = 1.0;
} completion:^(BOOL finished) {
[UIView animateWithDuration:0.25
animations:^{
image_3.alpha = 1.0;
} completion:^(BOOL finished) {
;
}];
}];
}];
gives: internal compiler error: Segmentation fault
There is no error if the nesting contains two animation blocks. Is nested animation block no allowed or comes with some limitation?
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