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IOS第16天(5,Quartz2D雪花）
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#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
