iOS开发之创建并管理图像动画

主要学习UIImageView，UIImage，UISlider，UIStepper的用法，跳动的兔子界面如下：

ViewerControl.M

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{

    NSArray *hopAnimation;
    hopAnimation = [[NSArray alloc] initWithObjects:[UIImage imageNamed:@"frame-1.png"], [UIImage imageNamed:@"frame-2.png"],[UIImage imageNamed:@"frame-3.png"],[UIImage imageNamed:@"frame-4.png"],[UIImage imageNamed:@"frame-5.png"],[UIImage imageNamed:@"frame-6.png"],[UIImage imageNamed:@"frame-7.png"],[UIImage imageNamed:@"frame-8.png"],[UIImage imageNamed:@"frame-9.png"],[UIImage imageNamed:@"frame-10.png"],[UIImage imageNamed:@"frame-11.png"],[UIImage imageNamed:@"frame-12.png"],[UIImage imageNamed:@"frame-13.png"],[UIImage imageNamed:@"frame-14.png"],[UIImage imageNamed:@"frame-15.png"],[UIImage imageNamed:@"frame-16.png"],[UIImage imageNamed:@"frame-17.png"],[UIImage imageNamed:@"frame-18.png"],[UIImage imageNamed:@"frame-19.png"],[UIImage imageNamed:@"frame-20.png"], Nil];

    self.bunnyView1.animationImages = hopAnimation;
    self.bunnyView2.animationImages = hopAnimation;
    self.bunnyView3.animationImages = hopAnimation;
    self.bunnyView4.animationImages = hopAnimation;
    self.bunnyView5.animationImages = hopAnimation;
    self.bunnyView1.animationDuration = 1;
    self.bunnyView2.animationDuration = 1;
    self.bunnyView3.animationDuration = 1;
    self.bunnyView4.animationDuration = 1;
    self.bunnyView5.animationDuration = 1;

    [super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)viewDidUnload {
    [self setBunnyView1:nil];
    [self setBunnyView2:nil];
    [self setBunnyView3:nil];
    [self setBunnyView4:nil];
    [self setBunnyView5:nil];
    [self setHopsPerSecond:nil];
    [self setSpeedSlider:nil];
    [self setSpeedStepper:nil];
    [self setToggleButton:nil];

    [super viewDidUnload];
}
- (IBAction)toggleAnimation:(id)sender {
    if (self.bunnyView1.isAnimating) {
        [self.bunnyView1 stopAnimating];
        [self.bunnyView2 stopAnimating];
        [self.bunnyView3 stopAnimating];
        [self.bunnyView4 stopAnimating];
        [self.bunnyView5 stopAnimating];
        [self.toggleButton setTitle:@"Hop!" forState:UIControlStateNormal];
    }
    else{
        [self.bunnyView1 startAnimating];
        [self.bunnyView2 startAnimating];
        [self.bunnyView3 startAnimating];
        [self.bunnyView4 startAnimating];
        [self.bunnyView5 startAnimating];
        [self.toggleButton setTitle:@"Sit Still!" forState:UIControlStateNormal];
    }
}

- (IBAction)setSpeed:(id)sender {
    NSString *hopRateString;

    self.bunnyView3.animationDuration = 2 - self.speedSlider.value;
    self.bunnyView1.animationDuration = self.bunnyView3.animationDuration + ((float)(rand()%11+1)/10);
    self.bunnyView2.animationDuration = self.bunnyView3.animationDuration + ((float)(rand()%11+1)/10);
    self.bunnyView4.animationDuration = self.bunnyView3.animationDuration + ((float)(rand()%11+1)/10);
    self.bunnyView5.animationDuration = self.bunnyView3.animationDuration + ((float)(rand()%11+1)/10);

    [self.bunnyView1 startAnimating];
    [self.bunnyView2 startAnimating];
    [self.bunnyView3 startAnimating];
    [self.bunnyView4 startAnimating];
    [self.bunnyView5 startAnimating];

    [self.toggleButton setTitle:@"Sit Still!" forState:UIControlStateNormal];

    hopRateString = [[NSString alloc] initWithFormat:@"%1.2f hps", 1/(2-self.speedSlider.value)];
    self.hopsPerSecond.text = hopRateString;
}

- (IBAction)setIncrement:(id)sender {
    self.speedSlider.value = self.speedStepper.value;
    [self setSpeed:nil];
}
@end

ViewerControll.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@property (strong, nonatomic) IBOutlet UIImageView *bunnyView1;
@property (strong, nonatomic) IBOutlet UIImageView *bunnyView2;
@property (strong, nonatomic) IBOutlet UIImageView *bunnyView3;
@property (strong, nonatomic) IBOutlet UIImageView *bunnyView4;
@property (strong, nonatomic) IBOutlet UIImageView *bunnyView5;
@property (strong, nonatomic) IBOutlet UILabel *hopsPerSecond;
@property (strong, nonatomic) IBOutlet UISlider *speedSlider;
@property (strong, nonatomic) IBOutlet UIStepper *speedStepper;
@property (strong, nonatomic) IBOutlet UIButton *toggleButton;

- (IBAction)toggleAnimation:(id)sender;
- (IBAction)setSpeed:(id)sender;
- (IBAction)setIncrement:(id)sender;

@end