iOS刷幀動畫

標籤：

 1 @implementation NJView 2  3 /* 4 -(void)awakeFromNib 5 { 6  7     NSLog(@"awakeFromNib"); 8     // 建立CADisplayLink, 預設每秒60次 9     CADisplayLink *display = [CADisplayLink displayLinkWithTarget:self selector:@selector(updataImage)];10     // 將CADisplayLink加入到訊息迴圈中11     [display addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];12 }13  */14 15 16 - (id)initWithCoder:(NSCoder *)aDecoder17 {18     if (self = [super initWithCoder:aDecoder]) {19         NSLog(@"initWithCoder");20         21         // NSTimer一般用於定時的更新一些非介面上的資料22 //        [NSTimer scheduledTimerWithTimeInterval:23 //         0.1 target:self selector:@selector(updataImage) userInfo:nil repeats:YES];24  25         // 建立CADisplayLink, 預設每秒60次26         CADisplayLink *display = [CADisplayLink displayLinkWithTarget:self selector:@selector(updataImage)];27         // 將CADisplayLink加入到訊息迴圈中28         [display addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];29         30     }31     return self;32 }33 34 - (void)updataImage35 {36     [self setNeedsDisplay];37 }38 39 40 - (void)drawRect:(CGRect)rect41 {42     CGContextRef ctx = UIGraphicsGetCurrentContext();43 //    CGContextClearRect(ctx, rect);44     45     self.imageY += 10;46     47     if (self.imageY > rect.size.height) {48         self.imageY = 0;49     }50     // Drawing code51     UIImage *image = [UIImage imageNamed:@"snow"];52     [image   drawAtPoint:CGPointMake(10, self.imageY)];53     54     55 }

 

iOS刷幀動畫