[IPhone] 如何制作图片放大缩小的动画
代码下载地址：201207302119082861.rar
在IPhone SDK开发范例大全中,有很多的范例码
下面这段范例码,示范了两张图片的交换,以及放大缩小的动画
动画效果请参照下图
#import <UIKit/UIKit.h>
#define IMAGE_VIEW_1 100
#define IMAGE_VIEW_2 101
#define BIGRECT CGRectMake(0.0f, 0.0f, 320.0f, 435.0f)
#define SMALLRECT CGRectMake(130.0f, 187.0f, 60.0f, 60.0f)
@interface ToggleView: UIView
{
BOOL isOne;
}
@end
@implementation ToggleView
- (id) initWithFrame: (CGRect) aFrame;
{
self = [super initWithFrame:aFrame];
// Load both views, make them non-interactive
UIImageView *imgView1 = [[UIImageView alloc] initWithFrame:BIGRECT];
imgView1.image = [UIImage imageNamed:@"one.png"];
imgView1.userInteractionEnabled = NO;
imgView1.tag = IMAGE_VIEW_1;
UIImageView *imgView2 = [[UIImageView alloc] initWithFrame:SMALLRECT];
imgView2.image = [UIImage imageNamed:@"two.png"];
imgView2.userInteractionEnabled = NO;
imgView2.tag = IMAGE_VIEW_2;
// image 1 is in front of image 2 to begin
[self addSubview:imgView2];
[self addSubview:imgView1];
isOne = YES;
[imgView1 release];
[imgView2 release];
return self;
}
- (void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event
{
// Determine which view occupies which role
UIImageView *big = (UIImageView *)[self viewWithTag: (isOne ? IMAGE_VIEW_1 : IMAGE_VIEW_2)];
UIImageView *little = (UIImageView *)[self viewWithTag: (isOne ? IMAGE_VIEW_2 : IMAGE_VIEW_1)];
isOne = !isOne;
// Pack all the changes into the animation block
CGContextRef context = UIGraphicsGetCurrentContext();
[UIView beginAnimations:nil context:context];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:1.0];
[big setFrame:SMALLRECT];
[big setAlpha:0.5];
[little setFrame:BIGRECT];
[little setAlpha:1.0];
[UIView commitAnimations];
// Hide the shrunken "big" image.
[big setAlpha:0.0f];
[[big superview] bringSubviewToFront:big];
}
@end
@interface HelloController : UIViewController
@end
@implementation HelloController
- (void)loadView
{
ToggleView *contentView = [[ToggleView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
contentView.backgroundColor = [UIColor whiteColor];
self.view = contentView;
[contentView release];
}
@end
@interface SampleAppDelegate : NSObject <UIApplicationDelegate>
@end
@implementation SampleAppDelegate
- (void)applicationDidFinishLaunching:(UIApplication *)application {
UIWindow *window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
HelloController *hello = [[HelloController alloc] init];
[window addSubview:hello.view];
[window makeKeyAndVisible];
}
@end
int main(int argc, char *argv[])
{
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
int retVal = UIApplicationMain(argc, argv, nil, @"SampleAppDelegate");
[pool release];
return retVal;
}
#import <UIKit/UIKit.h>
#define IMAGE_VIEW_1 100
#define IMAGE_VIEW_2 101
#define BIGRECT CGRectMake(0.0f, 0.0f, 320.0f, 435.0f)
#define SMALLRECT CGRectMake(130.0f, 187.0f, 60.0f, 60.0f)
@interface ToggleView: UIView
{
BOOL isOne;
}
@end
@implementation ToggleView
- (id) initWithFrame: (CGRect) aFrame;
{
self = [super initWithFrame:aFrame];
// Load both views, make them non-interactive
UIImageView *imgView1 = [[UIImageView alloc] initWithFrame:BIGRECT];
imgView1.image = [UIImage imageNamed:@"one.png"];
imgView1.userInteractionEnabled = NO;
imgView1.tag = IMAGE_VIEW_1;
UIImageView *imgView2 = [[UIImageView alloc] initWithFrame:SMALLRECT];
imgView2.image = [UIImage imageNamed:@"two.png"];
imgView2.userInteractionEnabled = NO;
imgView2.tag = IMAGE_VIEW_2;
// image 1 is in front of image 2 to begin
[self addSubview:imgView2];
[self addSubview:imgView1];
isOne = YES;
[imgView1 release];
[imgView2 release];
return self;
}
- (void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event
{
// Determine which view occupies which role
UIImageView *big = (UIImageView *)[self viewWithTag: (isOne ? IMAGE_VIEW_1 : IMAGE_VIEW_2)];
UIImageView *little = (UIImageView *)[self viewWithTag: (isOne ? IMAGE_VIEW_2 : IMAGE_VIEW_1)];
isOne = !isOne;
// Pack all the changes into the animation block
CGContextRef context = UIGraphicsGetCurrentContext();
[UIView beginAnimations:nil context:context];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:1.0];
[big setFrame:SMALLRECT];
[big setAlpha:0.5];
[little setFrame:BIGRECT];
[little setAlpha:1.0];
[UIView commitAnimations];
// Hide the shrunken "big" image.
[big setAlpha:0.0f];
[[big superview] bringSubviewToFront:big];
}
@end
@interface HelloController : UIViewController
@end
@implementation HelloController
- (void)loadView
{
ToggleView *contentView = [[ToggleView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
contentView.backgroundColor = [UIColor whiteColor];
self.view = contentView;
[contentView release];
}
@end
@interface SampleAppDelegate : NSObject <UIApplicationDelegate>
@end
@implementation SampleAppDelegate
- (void)applicationDidFinishLaunching:(UIApplication *)application {
UIWindow *window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
HelloController *hello = [[HelloController alloc] init];
[window addSubview:hello.view];
[window makeKeyAndVisible];
}
@end
int main(int argc, char *argv[])
{
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
int retVal = UIApplicationMain(argc, argv, nil, @"SampleAppDelegate");
[pool release];
return retVal;
}
最重要的动画代码
- (void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event
{
// 這一段代碼,設定目前哪一張圖是大圖,哪一張是小圖
UIImageView *big = (UIImageView *)[self viewWithTag: (isOne ? IMAGE_VIEW_1 : IMAGE_VIEW_2)];
UIImageView *little = (UIImageView *)[self viewWithTag: (isOne ? IMAGE_VIEW_2 : IMAGE_VIEW_1)];
isOne = !isOne;
// 這是使用動畫的一些基本設定
CGContextRef context = UIGraphicsGetCurrentContext();
[UIView beginAnimations:nil context:context];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut]; // 設定為IN OUT的動畫
[UIView setAnimationDuration:1.0]; // 動畫時間為一秒
[big setFrame:SMALLRECT];
[big setAlpha:0.5];
[little setFrame:BIGRECT];
[little setAlpha:1.0];
[UIView commitAnimations];
// Hide the shrunken "big" image.
[big setAlpha:0.0f];
[[big superview] bringSubviewToFront:big];
}
@end
- (void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event
{
// 這一段代碼,設定目前哪一張圖是大圖,哪一張是小圖
UIImageView *big = (UIImageView *)[self viewWithTag: (isOne ? IMAGE_VIEW_1 : IMAGE_VIEW_2)];
UIImageView *little = (UIImageView *)[self viewWithTag: (isOne ? IMAGE_VIEW_2 : IMAGE_VIEW_1)];
isOne = !isOne;
// 這是使用動畫的一些基本設定
CGContextRef context = UIGraphicsGetCurrentContext();
[UIView beginAnimations:nil context:context];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut]; // 設定為IN OUT的動畫
[UIView setAnimationDuration:1.0]; // 動畫時間為一秒
[big setFrame:SMALLRECT];
[big setAlpha:0.5];
[little setFrame:BIGRECT];
[little setAlpha:1.0];
[UIView commitAnimations];
// Hide the shrunken "big" image.
[big setAlpha:0.0f];
[[big superview] bringSubviewToFront:big];
}
@end
代码中设定透明度的目的,为了就是小图放大的时候,才不会被原本在上面的大图盖到,导致看不到图
