本文介绍了一个简单的图片选择器控制器的实现方法。通过设置显示样式和过渡动画，可以在应用中呈现一个模态视图控制器用于选择图片。
SelectImageViewController *selectImage = [[SelectImageViewController alloc] init];
selectImage.modalPresentationStyle = UIModalPresentationFormSheet;
selectImage.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentModalViewController:selectImage animated:YES];
selectImage.modalPresentationStyle = UIModalPresentationFormSheet;
selectImage.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentModalViewController:selectImage animated:YES];
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