动画的暂停和恢复
基本动画创建的步骤
1 根据keypath创建动画对象
2 设置基本属性
3 添加到视图的图层
//
// MainViewController.m
// animation_demo3
//
// Created by mac on 13-9-30.
// Copyright (c) 2013年 mac. All rights reserved.
//
#import "MainViewController.h"
@interfaceMainViewController ()
@property (nonatomic,weak) UIView *myview;
@end
@implementation MainViewController
- (void)viewDidLoad
{
[superviewDidLoad];
// Do any additional setup after loading the view.
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(50, 50, 100, 100)];
[view setBackgroundColor:[UIColorredColor]];
[self.view addSubview:view];
self.myview = view;
}
- (void)rotateAnimation
{
CABasicAnimation *animation = [CABasicAnimationanimationWithKeyPath:@"transform.rotation.z"];
[animation setDuration:2.0f];
[animation setRepeatCount:HUGE_VALF];
[animation setToValue:@(M_PI * 2)];
//[animation setAutoreverses:YES];
[animation setRemovedOnCompletion:NO];
[self.myview.layer addAnimation:animation forKey:@"myrotate"];
}
- (void)scaleAnimation
{
CABasicAnimation *animation = [CABasicAnimationanimationWithKeyPath:@"transform.scale"];
[animation setFromValue:@(1)];
[animation setToValue:@(3)];
[animation setDuration:2.0f];
[animation setAutoreverses:YES];
[animation setRepeatCount:HUGE_VALF];
[self.myview.layer addAnimation:animation forKey:@"myscale"];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
CAAnimation *animation = [self.myview.layer animationForKey:@"myrotate"];
if (animation) {
if (self.myview.layer.speed == 0.0) {
[self resumeanimation];
} else {
[self pauseanimation];
}
} else {
[selfrotateAnimation];
}
}
- (void)pauseanimation
{
CFTimeInterval pausetime = [self.myview.layerconvertTime:CACurrentMediaTime() fromLayer:self.myview.layer];
[self.myview.layer setTimeOffset:pausetime];
[self.myview.layer setSpeed:0.0];
}
- (void)resumeanimation
{
CFTimeInterval pausetime = self.myview.layer.timeOffset;
CFTimeInterval begintime = CACurrentMediaTime() - pausetime;
[self.myview.layersetTimeOffset:0.0];
[self.myview.layer setBeginTime:begintime];
[self.myview.layer setSpeed:1.0];
}
@end
//
// AppDelegate.m
// animation_demo3
//
// Created by mac on 13-9-30.
// Copyright (c) 2013年 mac. All rights reserved.
//
#import "AppDelegate.h"
#import "MainViewController.h"
@interfaceAppDelegate ()
@property (nonatomic,weak) MainViewController *controller;
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindowalloc] initWithFrame:[[UIScreenmainScreen] bounds]];
// Override point for customization after application launch.
self.window.backgroundColor = [UIColorwhiteColor];
MainViewController *controller = [[MainViewControlleralloc] init];
[self.windowsetRootViewController:controller];
self.controller = controller;
[self.windowmakeKeyAndVisible];
returnYES;
}
- (void)applicationWillResignActive:(UIApplication *)application
{
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
[self.controllerpauseanimation];
}
- (void)applicationDidEnterBackground:(UIApplication *)application
{
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}
- (void)applicationWillEnterForeground:(UIApplication *)application
{
// Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}
- (void)applicationDidBecomeActive:(UIApplication *)application
{
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
[self.controllerresumeanimation];
}
- (void)applicationWillTerminate:(UIApplication *)application
{
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}
@end
