1.CUICatalog: Invalid asset name supplied: , or invalid scale factor: 2.000000
＝》原因：
You are calling [UIImage
imageNamed:@""] or [UIImage
imageNamed:nil].
No image will match the empty
string. If you are trying to clear the image,
pass nil instead of
calling imageNamed:.
原文：http://www.cnblogs.com/lihaibo-Leao/p/3741775.html