序列帧：肉眼可以接受最高每秒20帧以内的动画
属性：
- 设置 animation 图片
self.imageView.animationImages = self.array; - 设置播放时长
self.imageView.animationDuration = 0.1 * self.array.count; - 设置播放次数
self.imageView.animationRepeatCount = 1; - 开始播放动画
[self.imageView startAnimating]; - 停止播放动画
[self.imageView stopAnimating]; - 判断imageView的状态
if (self.imageView.isAnimating == NO) { }
一、OC 写法
方法一：使用Assets 资源常驻内存
//
// ViewController.m
// 7-序列帧动画
//
// Created by 千山我独行 on 16/10/29.
// Copyright © 2016年 千山我独行. All rights reserved.
//
#import "ViewController.h"
@interface ViewController ()
// moxing
@property (weak, nonatomic) IBOutlet UIImageView *imageView;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// 1.设置最后一帧为imageView的图片
self.imageView.image = [UIImage imageNamed:@"0017"];
// 2.获取 image 数组
NSMutableArray *imgArray = [NSMutableArray array];
for (int i=0; i<18; i++) {
NSString *str = [NSString stringWithFormat:@"%04d",i];
UIImage *image = [UIImage imageNamed:str];
[imgArray addObject:image];
}
// 3.设置 animation 图片数组
self.imageView.animationImages = imgArray;
// 设置播放时长
self.imageView.animationDuration = 0.1 * imgArray.count;
// 设置播放次数
self.imageView.animationRepeatCount = 1;
// 开始播放动画
[self.imageView startAnimating];
}
方法二：资源存储在 Bundle中，播放完成后，animationImages 指向 nil
//
// ViewController.m
// 7-序列帧动画
//
// Created by 千山我独行 on 16/10/29.
// Copyright © 2016年 千山我独行. All rights reserved.
//
#import "ViewController.h"
@interface ViewController ()
// moxing
@property (weak, nonatomic) IBOutlet UIImageView *imageView;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.imageView.image = [UIImage imageNamed:@"0017"];
NSMutableArray * imgArray = [NSMutableArray array];
for (int i=0; i<18; i++) {
NSString *str = [NSString stringWithFormat:@"%04d",i];
// 1.将资源放到 bundle 中
NSString *path = [[NSBundle mainBundle] pathForResource:str ofType:@".jpg"];
UIImage *image = [UIImage imageWithContentsOfFile:path];
[imgArray addObject:image];
}
self.imageView.animationImages = imgArray;
self.imageView.animationDuration = 0.1 * imgArray.count;
self.imageView.animationRepeatCount = 1;
[self.imageView startAnimating];
// 2.动画结束后、调用释放内存（在动画执行结束后，调用 ImageView 的 animationImages set方法，并指向nil，来释放内存）
[self performSelector:@selector(releaseMem) withObject:nil afterDelay:0.1 * imgArray.count];
}
// 3.释放内存
- (void)releaseMem {
self.imageView.animationImages = nil;
}
代码简化：
// 2.动画结束后、调用释放内存（在动画执行结束后，调用 ImageView 的 animationImages set方法，并指向nil，来释放内存）
[self performSelector:@selector(releaseMem) withObject:nil afterDelay:0.1 * imgArray.count];
}
// 3.释放内存
- (void)releaseMem {
self.imageView.animationImages = nil;
}
替换为：
点语法调用的是 set 方法，所以可以简化为 imageView 调用 performSelector 方法，并传入 nil 参数
[self.imageView performSelector:@selector(setAnimationImages:) withObject:nil afterDelay:0.1 * imgArray.count];
二、Swift
//
// ViewController.swift
// 11-序列帧动画-Swift
//
// Created by 千山我独行 on 16/10/30.
// Copyright © 2016年 千山我独行. All rights reserved.
//
import UIKit
let xCenter = UIScreen.mainScreen().bounds.origin.x / 2
class ViewController: UIViewController {
// MARK: - 懒加载
lazy var imageView: UIImageView = {
let frame = CGRect(x: 91, y: 80, width: 192, height: 284)
let imageView = UIImageView(frame: frame)
return imageView
}()
var btn = UIButton(type: UIButtonType.System)
// 动画资源数组
var dataArray = [UIImage]()
override func viewDidLoad() {
super.viewDidLoad()
// 添加播放按钮
btn.frame = CGRect(x: 50, y: 400, width: 275, height: 40)
btn.setTitle("播放动画", forState: UIControlState.Normal)
btn.addTarget(self, action: "playAnimation1DidClick", forControlEvents: UIControlEvents.TouchUpInside)
view.addSubview(imageView)
view.addSubview(btn)
}
// MARK: - 定义方法
// private: 私有方法、swift 比较严谨、button事件的调用是在编译时已经决定的，但是事件的触发来自于 runloop，编译器不会将它编译进来，只有运行时来调用，这是属于 oc 的调用方式，所以要使用 @objc 修饰
@objc private func playAnimation1DidClick() {
// 获取图片路径、存储到资源数组中
for i in 0...17 {
let name = NSString(format: "%04d", i);
let path = NSBundle.mainBundle().pathForResource(name as String, ofType: ".jpg");
let image = UIImage(contentsOfFile: path!)
guard let img = image else {
print("nil")
return
}
dataArray.append(img)
}
// 播放动画
self.playAnimation()
// 动画结束后、清空内存中的资源
imageView.performSelector("animationImages", withObject: nil, afterDelay: 0.1 * 17)
}
@objc private func playAnimation() {
imageView.animationImages = dataArray
imageView.animationDuration = 0.1 * 17
imageView.animationRepeatCount = 1
imageView.startAnimating()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
