IOS 播放雪花的两种方式(代码方式)

来源：互联网发布：d3.js 中文官网编辑：程序博客网时间：2024/06/05 03:06

IOS 播放雪花的两种方式(代码方式)

代码:

====================> .h 文件

// WWCShowSnowViewController.h

// TestCAOrUIViewAnimationApp7-30

// Created by Whitney.c on 15/7/30.

#import <UIKit/UIKit.h>

@interface WWCShowSnowViewController :UIViewController

{

UIImage *imageSnow;// 雪花图片

NSMutableArray *arrayImages;// 装载雪花的集合

NSTimer *timer;// timer 控制反复播放及播放速度

}

@end

====================> .m 文件

// WWCShowSnowViewController.m

// TestCAOrUIViewAnimationApp7-30

// Created by Whitney.c on 15/7/30.

#import "WWCShowSnowViewController.h"

@interface WWCShowSnowViewController ()

@end

@implementation WWCShowSnowViewController

static int index_tag =0;

- (void)viewDidLoad {

[superviewDidLoad];

// Do any additional setup after loading the view.

self.view.backgroundColor = [UIColorblackColor];

// 思路

// 1.准备雪花图片

// 2.准备装载雪花的集合

// 3.集合中装载UIImageView(雪花)，设置好透明度，X(随机)，Y固定在屏幕上放即可，W/H随机生成

// 4.结束动画，加入一个新的雪花(只改变X）-》防止动画看起来重复

// 分别加入了2种方式，代码粗糙，希望能有帮助

[selfloadSelfLayoutSubViews];

}

-(void)loadSelfLayoutSubViews

{

imageSnow = [UIImageimageNamed:@"snow"];

arrayImages = [[NSMutableArrayalloc] initWithCapacity:10];

float screenWidth = [[UIScreenmainScreen] bounds].size.width;

for (int i =0; i < 20; i++) {

// 随机生成的x

float x =arc4random()%(int)screenWidth;

float w = (arc4random()%20)+10 ;

float y = -30;

NSLog(@"x:%f,y:%f,w:%f",x,y,w);

UIImageView *iv = [[UIImageViewalloc] initWithFrame:CGRectMake(x, y, w, w)];

iv.image =imageSnow;

iv.alpha = ((float)(arc4random()%10))/10;

iv.tag = i ;

iv.backgroundColor = [UIColorclearColor];

[self.viewaddSubview:iv];

[arrayImagesaddObject:iv];

}

// 设定timer轮播动画

timer = [NSTimerscheduledTimerWithTimeInterval:0.3target:selfselector:@selector(startBeginAnimation:)userInfo:nilrepeats:YES];

}

#pragma mark - 动画开始前的准备

-(void)startBeginAnimation:(id)sender

{

NSLog(@" start begin Animation .....");

index_tag =index_tag + 1;

if (arrayImages && arrayImages.count >0) {

UIImageView *imgv = [arrayImagesobjectAtIndex:0];

imgv.tag =index_tag ;

[arrayImagesremoveObjectAtIndex:0];

// 开始动画

[selfanimationStart1:imgv];

}

#pragma mark - 开始动画1

-(void)animationStart1:(UIImageView*)imgv

{

[UIViewanimateWithDuration:6animations:^{

CGRect frame = imgv.frame;

frame.origin.y = [[UIScreenmainScreen] bounds].size.height;

imgv.frame = frame;

}completion:^(BOOL finished){

CGRect frame = imgv.frame;

frame.origin.x =arc4random()%(int)([[UIScreenmainScreen] bounds].size.width);

frame.origin.y = -30;

imgv.frame = frame;

[arrayImagesaddObject:imgv];

}];

}

#pragma mark - 开始动画2

-(void)animationStart2:(UIImageView*)imgv

{

[UIViewbeginAnimations:[NSStringstringWithFormat:@"%d",imgv.tag]context:nil];

[UIViewsetAnimationDuration:6];// 动画时间

[UIViewsetAnimationDelegate:self];// 动画代理

// 要调整的Frame(原始的Frame到次Frame的过度动画)

CGRect frame = imgv.frame;

imgv.frame =CGRectMake(frame.origin.x, [[UIScreenmainScreen] bounds].size.height, frame.size.width, frame.size.height);

[UIViewcommitAnimations];//提交动画

}

#pragma mark - 动画2代理实现->当动画停止时

- (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)contex

{

NSLog(@"did stop 2");

UIImageView *imageView = (UIImageView *)[self.viewviewWithTag:[animationID integerValue]];

float x =arc4random()%(int)([[UIScreenmainScreen] bounds].size.width);

float w = (arc4random()%20)+10 ;

float y = -30;

imageView.frame =CGRectMake(x, y, w, w);

[arrayImagesaddObject:imageView];

}

- (void)didReceiveMemoryWarning {

[superdidReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

// Get the new view controller using [segue destinationViewController].

// Pass the selected object to the new view controller.

}

@end

// 附图

0 0