实现loading动画效果

下面我就来罗列三种实现loading动画效果的方法。

方法一：使用UIImageView自带的方法来实现，这也是我推荐的实现方法。

 

NSMutableArray *array = [[NSMutableArray alloc] initWithObjects:[UIImage imageNamed:@"1.png"],[UIImage imageNamed:@"2.png"],[UIImage imageNamed:@"3.png"],[UIImage imageNamed:@"4.png"],[UIImage imageNamed:@"5.png"], nil nil];

UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 200, 80, 30)];

imageView.animationImages = array; //动画图片数组
imageView.animationDuration = 2; //执行一次完整动画所需的时长
//    gifImageView.animationRepeatCount = 0;  //动画重复次数 0表示无限次，默认为0
[imageView startAnimating];
[self.view addSubview:imageView];

 

方法二：使用UIImageView+NSTimer(定时器)来实现，如果没有猜错的话，第一种方式内部的实现方法也是使用了定时器，只不过我们第二种方法是自己DIY一个属于自己的

控件，自己想要扩展什么功能就扩展什么。

 

#import <UIKit/UIKit.h>

@interface imageAnimation : UIImageView

@property (strong, nonatomic) NSTimer *animation_timer;

@property (strong, nonatomic) NSMutableArray *imageArray;

@property (assign) int currentIndex;

@property (assign) float interval;
- (void)startLoading;

- (void)stopLoading;

- (void)initLoadingView:(NSMutableArray *)imageArray timeInterval:(float)time;

@end

 

 

#import "imageAnimation.h"

@implementation imageAnimation
@synthesize animation_timer = _animation_timer;
@synthesize imageArray = _imageArray;
@synthesize currentIndex = _currentIndex;
@synthesize interval = _interval;


- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code

    }
    return self;
}

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    // Drawing code
}
*/

- (void)initLoadingView:(NSMutableArray *)imageArray timeInterval:(float)time{
    self.imageArray = imageArray;
    self.interval = time;

    self.animation_timer = [NSTimer scheduledTimerWithTimeInterval:self.interval target:self selector:@selector(startLoading) userInfo:nil repeats:YES];
}

//开始loading
- (void)startLoading{
    if(!self.imageArray || self.imageArray.count < 1){
        [self.animation_timer invalidate];
        return;
    }

    self.currentIndex = (self.currentIndex +1)%self.imageArray.count;
    self.image = [UIImage imageNamed:[self.imageArray objectAtIndex:self.currentIndex]];
}

//结束loading
-(void)stopLoading{
    [self.animation_timer invalidate];
}


@end

方法三：使用UIWebView来加载gif图片，除非你要用到webView,不然就不要使用这种方式来实现

 

NSData *gif = [NSData dataWithContentsOfFile: [[NSBundle mainBundle] pathForResource:@"1" ofType:@"gif"]];
// view生成
UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(100, 100, 70, 30)];
webView.userInteractionEnabled = NO;//用户不可交互
[webView loadData:gif MIMEType:@"image/gif" textEncodingName:nil baseURL:nil];
[self.view addSubview:webView];