Question

UIImagePickerController 预览图是模糊的，为啥

Answer 1

自己定义一个导航控制器变量myNavitionController

在跳转的时候，把navigationController保存到这个变量来。

-(void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
NSLog(@"dddd %@", navigationController.viewControllers);
self.myNavitionController = navigationController;

}

然后在点击图片的时候

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{

NSLog(@"灌灌灌灌%@", self.myNavitionController.viewControllers);

[self.myNavitionController pushViewController:filtersViewController animated:NO];
}

ok，完美

Answer 2

图片像素多少？命名是@2x还是@3x？你用的什么测试设备（4S还是6 Plus）？最后，image是不是draw到context里的？