（素材源碼）swanzhu學IOS（一）UI之_雪花下落

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源碼地址:http://download.csdn.net/detail/swanzhu/8970029

1  定時器加動畫版

////  ZYViewController.m//  ChongYongXuehua1////  Created by mac on 15-8-6.//  Copyright (c) 2015年 zhiyou. All rights reserved.//#import "ZYViewController.h"@interface ZYViewController ()@end@implementation ZYViewController- (void)viewDidLoad{    [super viewDidLoad];    UIImageView  *backImageView=[[UIImageView alloc] initWithFrame:self.view.frame];        backImageView.image=[UIImage imageNamed:@"bg.png"];    [self.view addSubview:backImageView];//    全域變數    array=[[NSMutableArray alloc] initWithCapacity:0];        for (int i=0; i<10; i++) {        UIImageView *snowImageView=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"flake.png"]];        snowImageView.frame=CGRectMake(30, -30, 30, 30);        snowImageView.tag=1;        [array addObject:snowImageView];        [self.view addSubview:snowImageView];    }            [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(onTimer) userInfo:nil repeats:YES];        }-(void)onTimer{      for (int i=0; i<array.count; i++) {        UIImageView *snow=[array objectAtIndex:i];                if (snow.tag==1) {                        snow.tag=2;            snow.frame=CGRectMake(arc4random()%290, -30, 30, 30);                        [UIView beginAnimations:nil context:(__bridge void *)(snow)];            [UIView setAnimationDuration:3];                        [UIView setAnimationDelegate:self];            [UIView setAnimationDidStopSelector:@selector(a:b:c:)];                        snow.frame=CGRectMake(arc4random()%290, 450, 30, 30);                        [UIView commitAnimations];                        break;        }    }    }-(void)a:(NSString *)name  b:(NSNumber *)num c:(void *)context{    UIImageView *snow=(__bridge UIImageView *)(context);    snow.tag=1;    }- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

2  一個定時器

#import "ZYViewController.h"@interface ZYViewController ()@end@implementation ZYViewController- (void)viewDidLoad{    [super viewDidLoad];UIImageView  *backImageView=[[UIImageView alloc] initWithFrame:self.view.frame];        backImageView.image=[UIImage imageNamed:@"bg.png"];    [self.view addSubview:backImageView];        array=[[NSMutableArray alloc] initWithCapacity:0];        for (int i=0; i<10; i++) {        UIImageView *snowImageView=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"flake.png"]];        snowImageView.frame=CGRectMake(30, -30, 30, 30);        snowImageView.tag=1;        [array addObject:snowImageView];        [self.view addSubview:snowImageView];    }            [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(onTimer) userInfo:nil repeats:YES];        }-(void)onTimer{    static int count=0;        if (count%20==0) {        for (int i=0; i<array.count; i++) {            UIImageView *snow=[array objectAtIndex:i];            if (snow.tag==1) {                snow.tag=2;                snow.frame=CGRectMake(arc4random()%290, -30, 30, 30);                break;            }        }       }         count++;           for (UIImageView *snow2 in array) {        if (snow2.tag==2) {            snow2.frame=CGRectMake(arc4random()%290, snow2.frame.origin.y+5, 30, 30);                                    if (snow2.frame.origin.y>510) {                snow2.tag=1;            }        }    }}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}

3 用兩個定時器

#import "ZYViewController.h"@interface ZYViewController ()@end@implementation ZYViewController- (void)viewDidLoad{    [super viewDidLoad];UIImageView  *backImageView=[[UIImageView alloc] initWithFrame:self.view.frame];        backImageView.image=[UIImage imageNamed:@"bg.png"];    [self.view addSubview:backImageView];        array=[[NSMutableArray alloc] initWithCapacity:0];        for (int i=0; i<10; i++) {        UIImageView *snowImageView=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"flake.png"]];        snowImageView.frame=CGRectMake(30, -30, 30, 30);        snowImageView.tag=1;        [array addObject:snowImageView];        [self.view addSubview:snowImageView];    }            [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(onTimer) userInfo:nil repeats:YES];        [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(Timer) userInfo:nil repeats:YES];}-(void)onTimer{        static int count=0;        if (count%30==0) {        for (int i=0; i<array.count; i++) {            UIImageView *snow=[array objectAtIndex:i];                                    if (snow.tag==1) {                snow.tag=2;                                snow.frame=CGRectMake(arc4random()%290, -30, 30, 30);                                break;            }        }            }    count++;          }-(void)Timer{    for (int i=0; i<array.count; i++) {             UIImageView *snow=[array objectAtIndex:i];                if (snow.tag==2) {            snow.frame=CGRectMake(arc4random()%290, snow.frame.origin.y+5, 30, 30);        }                if (snow.frame.origin.y>480) {            snow.tag=1;        }    }}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}

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（素材源碼）swanzhu學IOS（一）UI之_雪花下落