IOS学习 －两个图片切换显示

在学习IOS的开发。

初次感觉像VC的文件目录结构。语法是自身独有的结构。

下面看一个例子

    self = [super initWithFrame:frame];
    if (self) {
		isOne = YES;
		imgView1 = [[UIImageView alloc] initWithFrame:BIGRECT];
		imgView2 = [[UIImageView alloc] initWithFrame:SMALLRECT];
		
		[imgView1 setImage:[UIImage imageNamed:@"btnFTP.png"]];
		[imgView2 setImage:[UIImage imageNamed:@"btnNews.png"]];
		
		imgView1.userInteractionEnabled = NO;
		imgView2.userInteractionEnabled = NO;
		
		[self addSubview:imgView2];
		[self addSubview:imgView1];
		
		[imgView1 release];
		[imgView2 release];

    }
    return self;

本 代码是初始化两个UIVIew的图片，并将这两个图片交给父窗体管理。

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
	
	UIImageView *big = isOne ? imgView1 : imgView2;
	UIImageView *little = isOne ? imgView2 : imgView1;
	isOne = !isOne;
	
	/*
	UITouch *touch = [touches anyObject];
	if ([touch phase] != UITouchPhaseBegan) {
		return;
	}	
	*/
	
	CGContextRef context = UIGraphicsGetCurrentContext();
	[UIView beginAnimations:nil context:context];
	[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];

	[UIView setAnimationDuration:1.0];
	
	//[imgView setAlpha:(float)isVisible];
	[big setFrame:SMALLRECT];
	[big setAlpha:0.5];
	[little setFrame:BIGRECT];
	[little setAlpha:1.0];
	
	[UIView commitAnimations];
	
	[big setAlpha:0.0f];
	[[big superview] bringSubviewToFront:big];
	
}

此段代码是将以上两个imgview做一个动画切换。。。

切换过程中实现淡入淡出的效果。

页面翻转的代码

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
	
	
	CGContextRef context = UIGraphicsGetCurrentContext();
	[UIView beginAnimations:nil context:context];
	[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self cache:YES];
	[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
	[UIView setAnimationDuration:1.0];
	
	[self  exchangeSubviewAtIndex:1 withSubviewAtIndex:0];
	
	[UIView commitAnimations];
		
}