IOS 播放雪花的兩種方式(代碼方式)
代碼:
====================> .h 文件
//
// WWCShowSnowViewController.h
// TestCAOrUIViewAnimationApp7-30
//
// Created by Whitney.c on 15/7/30.
// Copyright (c) 2015年 ZhongShan Sun union Medical Technology Co. Ltd. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface WWCShowSnowViewController : UIViewController
{
UIImage *imageSnow; // 雪花圖片
NSMutableArray *arrayImages; // 裝載雪花的集合
NSTimer *timer; // timer 控制反覆播放及播放速度
}
@end
====================> .m 文件
//
// WWCShowSnowViewController.m
// TestCAOrUIViewAnimationApp7-30
//
// Created by Whitney.c on 15/7/30.
// Copyright (c) 2015年 ZhongShan Sun union Medical Technology Co. Ltd. All rights reserved.
//
#import "WWCShowSnowViewController.h"
@interface WWCShowSnowViewController ()
@end
@implementation WWCShowSnowViewController
static int index_tag = 0;
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor blackColor];
// 思路
// 1.準備雪花圖片
// 2.準備裝載雪花的集合
// 3.集合中裝載UIImageView(雪花)，設置好透明度，X(隨機)，Y固定在屏幕上放即可，W/H 隨機生成
// 4.結束動畫，加入一個新的雪花(只改變X）-》防止動畫看起來重複
// 分別加入了2種方式， 代碼粗糙，希望能有幫助
[self loadSelfLayoutSubViews];
}
-(void)loadSelfLayoutSubViews
{
imageSnow = [UIImage imageNamed:@"snow"];
arrayImages = [[NSMutableArray alloc] initWithCapacity:10];
float screenWidth = [[UIScreen mainScreen] bounds].size.width;
for (int i = 0; i < 20; i++) {
// 隨機生成的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 = [[UIImageView alloc] initWithFrame:CGRectMake(x, y, w, w)];
iv.image = imageSnow;
iv.alpha = ((float)(arc4random()%10))/10;
iv.tag = i ;
iv.backgroundColor = [UIColor clearColor];
[self.view addSubview:iv];
[arrayImages addObject:iv];
}
// 設定timer 輪播動畫
timer = [NSTimer scheduledTimerWithTimeInterval:0.3 target:self selector:@selector(startBeginAnimation:) userInfo:nil repeats:YES];
}
#pragma mark - 動畫開始前的準備
-(void)startBeginAnimation:(id)sender
{
NSLog(@" start begin Animation .....");
index_tag = index_tag + 1;
if ( arrayImages && arrayImages.count >0) {
UIImageView *imgv = [arrayImages objectAtIndex:0];
imgv.tag = index_tag ;
[arrayImages removeObjectAtIndex:0];
// 開始動畫
[self animationStart1:imgv];
}
}
#pragma mark - 開始動畫1
-(void)animationStart1:(UIImageView*)imgv
{
[UIView animateWithDuration:6 animations:^{
CGRect frame = imgv.frame;
frame.origin.y = [[UIScreen mainScreen] bounds].size.height;
imgv.frame = frame;
}completion:^(BOOL finished){
CGRect frame = imgv.frame;
frame.origin.x = arc4random()%(int)([[UIScreen mainScreen] bounds].size.width);
frame.origin.y = -30;
imgv.frame = frame;
[arrayImages addObject:imgv];
}];
}
#pragma mark - 開始動畫2
-(void)animationStart2:(UIImageView*)imgv
{
[UIView beginAnimations:[NSString stringWithFormat:@"%d",imgv.tag] context:nil];
[UIView setAnimationDuration:6]; // 動畫時間
[UIView setAnimationDelegate:self]; // 動畫代理
// 要調整的Frame(原始的Frame到次Frame的過度動畫)
CGRect frame = imgv.frame;
imgv.frame = CGRectMake(frame.origin.x, [[UIScreen mainScreen] bounds].size.height, frame.size.width, frame.size.height);
[UIView commitAnimations];// 提交動畫
}
#pragma mark - 動畫2代理實現-> 當動畫停止時
- (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)contex
{
NSLog(@"did stop 2");
UIImageView *imageView = (UIImageView *)[self.view viewWithTag:[animationID integerValue]];
float x = arc4random()%(int)([[UIScreen mainScreen] bounds].size.width);
float w = (arc4random()%20)+ 10 ;
float y = -30;
imageView.frame = CGRectMake(x, y, w, w);
[arrayImages addObject:imageView];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// 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
// 附圖
