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我在iOS中創建旋鈕按鈕。圖形設計師爲我提供了png圖層，因此我使用圖像上下文來混合圖層。CGGraphics圖像上下文動畫旋轉在iOS 5.1中
旋轉時，只有一部分圖層旋轉。我的目標是動畫這些旋轉。
目前，我使用
- (BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event
- (BOOL)continueTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event
- (BOOL)endTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event
。
這工作正常。我的障礙是，在
- (BOOL)endTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event
我想做一個「捕捉」動畫。我怎樣才能做到這一點？ 我不確定在這種情況下如何使用仿射變換由於混合。下面的方法是我如何建立圖像：
- (UIImage *)knobImageWithRadians:(float)radians
{
UIImage *i05 = [UIImage imageNamed:@"05 - Metal Over Empty Space - ROTATE ME.png"];
UIImage *i04 = [UIImage imageNamed:@"04 - Inner Knob.png"];
UIImage *i03 = [UIImage imageNamed:@"03 - Over Knob Metal - (OVERLAY BLEND) - ROTATE ME.png"];
UIImage *i02 = [UIImage imageNamed:@"02 - Numbers and Dashes - ROTATE ME.png"];
UIImage *i01 = [UIImage imageNamed:@"01 - Reflective Overlay - (COLOR DODGE BLEND).png"];
CGSize size = i11.size;
UIGraphicsBeginImageContext(size);
CGContextRef bitmap = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(bitmap, size.width/2, size.height/2);
[i04 drawInRect:CGRectMake(-i04.size.width/2, -i04.size.height/2, i04.size.width, i04.size.height) blendMode:kCGBlendModeNormal alpha:1.0];
CGContextRotateCTM(bitmap, radians);
[i03 drawInRect:CGRectMake(-i03.size.width/2, -i03.size.height/2, i03.size.width, i03.size.height) blendMode:kCGBlendModeOverlay alpha:1.0];
[i02 drawInRect:CGRectMake(-i02.size.width/2, -i02.size.height/2, i02.size.width, i02.size.height) blendMode:kCGBlendModeNormal alpha:1.0];
CGContextRotateCTM(bitmap, -radians);
[i01 drawInRect:CGRectMake(-i01.size.width/2, -i01.size.height/2, i01.size.width, i01.size.height) blendMode:kCGBlendModeColorDodge alpha:1.0];
UIImage* blendedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return blendedImage;
}
UPDATE：
現在，我只是讓它直接扣沒有任何動畫。