Xcod : Imageを Fade-In Fade-Outさせる

Image_FadeIn_FadeOutViewController.h

#import <UIKit/UIKit.h>

@interface Image_FadeIn_FadeOutViewController : UIViewController {
 
 IBOutlet UIImageView *image;
 IBOutlet UIButton *button;
}

-(IBAction)hideImage;

@end

Image_FadeIn_FadeOutViewController.m

#import "Image_FadeIn_FadeOutViewController.h"

@implementation Image_FadeIn_FadeOutViewController

-(IBAction)hideImage{
 CGContextRef imageContext = UIGraphicsGetCurrentContext();
 
 if (image.alpha == 1) {
  [UIView beginAnimations:nil context:imageContext];
  [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
  [UIView setAnimationDuration:4];
  [UIView setAnimationDelegate:self];
  image.alpha = 0.0;
  [button setTitle:@"Show Cat" forState:UIControlStateNormal];
 }else if (image.alpha == 0) {
  [UIView beginAnimations:nil context:imageContext];
  [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
  [UIView setAnimationDuration:4];
  [UIView setAnimationDelegate:self];
  image.alpha = 1;
  [button setTitle:@"Hide Cat" forState:UIControlStateNormal];
 }
 
 [UIView commitAnimations];
 
}

- (void)didReceiveMemoryWarning {
 // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
 
 // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
 // Release any retained subviews of the main view.
 // e.g. self.myOutlet = nil;
}


- (void)dealloc {
    [super dealloc];
}

@end

詳解 Objective-C 2.0 改訂版: 荻原 剛志

iPhoneプログラミングUIKit詳解リファレンス: 所 友太, 京セラコミュニケーションシステム株式会社

iPhone SDK アプリケーション開発ガイド: Jonathan Zdziarski, 近藤 誠 (監訳), 武舎 広幸, 武舎 るみ