UIButtonの画像をアニメ化

UIButton *button = 
　　　　[UIButton buttonWithType:UIButtonTypeCustom];

NSArray *anmImgNms = 
　　　　[NSArray arrayWithObjects:
　　　　　　@"anm1.png", @"anm2.png", @"anm3.png", nil];

NSMutableArray *anmImgs = 
　　　　[NSMutableArray arrayWithCapacity:[anmImgNms count]];

for (NSString *anmImgNm in anmImgNms) {
　　　　UIImg *img = [UIImg imgNmd:anmImgNm];
　　　　[anmImgs addObject:img];
}

[button setImg:[anmImgs objectAtIndex:0] 
　　　　forState:UIControlStateNormal];

button.imgView.anmImgs = anmImgs;
button.imgView.anmDuration = 2.0;

[button.imgView startAnimating];
[self.view addSubview:button];