学步园

unbalanced calls to begin/end appearance transitions
for uiviewcontroller的解决方法

1、ios开发中，进行视图跳转时，可能会遇到上面的警告日志，

比如，在loadView、viewDidLoad、viewWillAppear中，使用下面的代码：

XXXView* viewTemp = [[PrimaryView alloc] init];
viewTemp.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentViewController:viewTemp animated:YES completion:nil];

解决办法：

在viewDidAppear中执行上述代码即可；

2、视图跳转无效解决

[self dismissViewControllerAnimated:YES completion:nil]; 
// YES会导致下面一行代码执行时，视图无法跳转
XXXView* viewTemp = [[PrimaryView alloc] init];
viewTemp.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentViewController:viewTemp animated:YES completion:nil];

解决办法：

[self dismissViewControllerAnimated:YES completion:^{
        XXXView* viewTemp = [[PrimaryView alloc] init];
        viewTemp.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
        [self presentViewController:viewTemp animated:YES completion:nil];
    }];