#import "HMView.h"

@interface HMView()

{

    int count;

}

@property (nonatomic, assign) CGFloat snowY;

@end

@implementation HMView

- (id)initWithFrame:(CGRect)frame

{

    self = [super initWithFrame:frame];

    if (self) {

        // Initialization code

    }

    return self;

}

// 加载xib完毕就调用

- (void)awakeFromNib

{

//    [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(setNeedsDisplay) userInfo:nil repeats:YES];

    // iphone每秒刷新60次

    // 屏幕刷新的时候就会触发

    CADisplayLink *link = [CADisplayLink displayLinkWithTarget:self selector:@selector(setNeedsDisplay)];

    [link addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];

}

// Only override drawRect: if you perform custom drawing.

// An empty implementation adversely affects performance during animation.

- (void)drawRect:(CGRect)rect

{

    _snowY += ;

        UIImage *image = [UIImage imageNamed:@"雪花"];

        [image drawAtPoint:CGPointMake(, _snowY)];

    // Drawing code

    if (_snowY >= ) {

        _snowY = ;

    }

}

@end