我正在做一些测试，绘制一个PaintCode progressView，在自定义UIView控制器中实现它... 众所周知，该过程放置一个UIView对象并更改其类progressview，以便在viewcontroller中调用视图中的自定义。
到目前为止，我唯一的问题是，当我去编译项目时，我总是得到一个灰色圆圈或矩形（取决于视图控制器中包含的视图的大小），这将叠加我的个性化进度视图。 ..
我不明白我错在哪里因为我插入的唯一代码只是一个简单的自定义文件ProgressView（子类ProgressView）。在视图控制器中没有任何东西......
我按照教程和'这个 http://www.raywenderlich.com/it/44556/paintcode-tutorial-progress-bar-custom
你知道如何解决我的问题吗？感谢所有未来的援助罗里。
- (void)drawRect:(CGRect)rect
{
//// General Declarations
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = UIGraphicsGetCurrentContext();
//// Color Declarations
UIColor* fillColor = [UIColor colorWithRed: 0.416 green: 0.416 blue: 0.416 alpha: 1];
UIColor* strokeColor = [UIColor colorWithRed: 0.322 green: 0.322 blue: 0.322 alpha: 1];
UIColor* shadowColor2 = [UIColor colorWithRed: 0.2 green: 0.2 blue: 0.2 alpha: 1];
UIColor* shadowColor3 = [UIColor colorWithRed: 0.671 green: 0.671 blue: 0.671 alpha: 1];
UIColor* fillColor2 = [UIColor colorWithRed: 0.247 green: 0.247 blue: 0.247 alpha: 1];
UIColor* strokeColor2 = [UIColor colorWithRed: 0.188 green: 0.188 blue: 0.188 alpha: 1];
UIColor* color = [UIColor colorWithRed: 0 green: 0.886 blue: 0 alpha: 1];
//// Gradient Declarations
NSArray* outerRectGradientColors = [NSArray arrayWithObjects:
(id)strokeColor.CGColor,
(id)fillColor.CGColor, nil];
CGFloat outerRectGradientLocations[] = {0, 1};
CGGradientRef outerRectGradient = CGGradientCreateWithColors(colorSpace, (__bridge CFArrayRef)outerRectGradientColors, outerRectGradientLocations);
NSArray* gradientColors = [NSArray arrayWithObjects:
(id)strokeColor2.CGColor,
(id)fillColor2.CGColor, nil];
CGFloat gradientLocations[] = {0, 1};
CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (__bridge CFArrayRef)gradientColors, gradientLocations);
//// Shadow Declarations
UIColor* darkShadow = shadowColor2;
CGSize darkShadowOffset = CGSizeMake(3.1, 3.1);
CGFloat darkShadowBlurRadius = 5;
UIColor* lightShadow = shadowColor3;
CGSize lightShadowOffset = CGSizeMake(3.1, 3.1);
CGFloat lightShadowBlurRadius = 5;
//// Frames
CGRect progressIndicatorFrame = CGRectMake(-1, 0, 321, 47);
//// Subframes
CGRect group = CGRectMake(CGRectGetMinX(progressIndicatorFrame) + 10, CGRectGetMinY(progressIndicatorFrame) + 9, CGRectGetWidth(progressIndicatorFrame) - 25, 20);
CGRect activeProgressFrame = CGRectMake(CGRectGetMinX(group) + floor(CGRectGetWidth(group) * 0.00000 + 0.5), CGRectGetMinY(group) + floor(CGRectGetHeight(group) * 0.00000 + 0.5), floor(CGRectGetWidth(group) * 1.00000 + 0.5) - floor(CGRectGetWidth(group) * 0.00000 + 0.5), floor(CGRectGetHeight(group) * 1.00000 + 0.5) - floor(CGRectGetHeight(group) * 0.00000 + 0.5));
//// Abstracted Attributes
CGRect progressTrackActiveRect = CGRectMake(CGRectGetMinX(activeProgressFrame) + 4, CGRectGetMinY(activeProgressFrame) + 5, CGRectGetWidth(activeProgressFrame) - 8, 10);
//// Progress Bar
{
//// Border Drawing
CGRect borderRect = CGRectMake(CGRectGetMinX(progressIndicatorFrame) + 2, CGRectGetMinY(progressIndicatorFrame) + 3, CGRectGetWidth(progressIndicatorFrame) - 5, 34);
UIBezierPath* borderPath = [UIBezierPath bezierPathWithRoundedRect: borderRect cornerRadius: 4];
CGContextSaveGState(context);
CGContextSetShadowWithColor(context, darkShadowOffset, darkShadowBlurRadius, darkShadow.CGColor);
CGContextBeginTransparencyLayer(context, NULL);
[borderPath addClip];
CGContextDrawLinearGradient(context, outerRectGradient,
CGPointMake(CGRectGetMidX(borderRect), CGRectGetMinY(borderRect)),
CGPointMake(CGRectGetMidX(borderRect), CGRectGetMaxY(borderRect)),
0);
CGContextEndTransparencyLayer(context);
////// Border Inner Shadow
CGRect borderBorderRect = CGRectInset([borderPath bounds], -lightShadowBlurRadius, -lightShadowBlurRadius);
borderBorderRect = CGRectOffset(borderBorderRect, -lightShadowOffset.width, -lightShadowOffset.height);
borderBorderRect = CGRectInset(CGRectUnion(borderBorderRect, [borderPath bounds]), -1, -1);
UIBezierPath* borderNegativePath = [UIBezierPath bezierPathWithRect: borderBorderRect];
[borderNegativePath appendPath: borderPath];
borderNegativePath.usesEvenOddFillRule = YES;
CGContextSaveGState(context);
{
CGFloat xOffset = lightShadowOffset.width + round(borderBorderRect.size.width);
CGFloat yOffset = lightShadowOffset.height;
CGContextSetShadowWithColor(context,
CGSizeMake(xOffset + copysign(0.1, xOffset), yOffset + copysign(0.1, yOffset)),
lightShadowBlurRadius,
lightShadow.CGColor);
[borderPath addClip];
CGAffineTransform transform = CGAffineTransformMakeTranslation(-round(borderBorderRect.size.width), 0);
[borderNegativePath applyTransform: transform];
[[UIColor grayColor] setFill];
[borderNegativePath fill];
}
CGContextRestoreGState(context);
CGContextRestoreGState(context);
//// ProgressTrack Drawing
CGRect progressTrackRect = CGRectMake(CGRectGetMinX(progressIndicatorFrame) + 12, CGRectGetMinY(progressIndicatorFrame) + 12, CGRectGetWidth(progressIndicatorFrame) - 29, 14);
UIBezierPath* progressTrackPath = [UIBezierPath bezierPathWithRoundedRect: progressTrackRect cornerRadius: 7];
CGContextSaveGState(context);
CGContextSetShadowWithColor(context, lightShadowOffset, lightShadowBlurRadius, lightShadow.CGColor);
CGContextBeginTransparencyLayer(context, NULL);
[progressTrackPath addClip];
CGContextDrawLinearGradient(context, gradient,
CGPointMake(CGRectGetMidX(progressTrackRect), CGRectGetMinY(progressTrackRect)),
CGPointMake(CGRectGetMidX(progressTrackRect), CGRectGetMaxY(progressTrackRect)),
0);
CGContextEndTransparencyLayer(context);
////// ProgressTrack Inner Shadow
CGRect progressTrackBorderRect = CGRectInset([progressTrackPath bounds], -darkShadowBlurRadius, -darkShadowBlurRadius);
progressTrackBorderRect = CGRectOffset(progressTrackBorderRect, -darkShadowOffset.width, -darkShadowOffset.height);
progressTrackBorderRect = CGRectInset(CGRectUnion(progressTrackBorderRect, [progressTrackPath bounds]), -1, -1);
UIBezierPath* progressTrackNegativePath = [UIBezierPath bezierPathWithRect: progressTrackBorderRect];
[progressTrackNegativePath appendPath: progressTrackPath];
progressTrackNegativePath.usesEvenOddFillRule = YES;
CGContextSaveGState(context);
{
CGFloat xOffset = darkShadowOffset.width + round(progressTrackBorderRect.size.width);
CGFloat yOffset = darkShadowOffset.height;
CGContextSetShadowWithColor(context,
CGSizeMake(xOffset + copysign(0.1, xOffset), yOffset + copysign(0.1, yOffset)),
darkShadowBlurRadius,
darkShadow.CGColor);
[progressTrackPath addClip];
CGAffineTransform transform = CGAffineTransformMakeTranslation(-round(progressTrackBorderRect.size.width), 0);
[progressTrackNegativePath applyTransform: transform];
[[UIColor grayColor] setFill];
[progressTrackNegativePath fill];
}
CGContextRestoreGState(context);
CGContextRestoreGState(context);
//// Group
{
//// ProgressTrackActive Drawing
UIBezierPath* progressTrackActivePath = [UIBezierPath bezierPathWithRoundedRect: progressTrackActiveRect cornerRadius: 5];
[color setFill];
[progressTrackActivePath fill];
}
}
//// Cleanup
CGGradientRelease(outerRectGradient);
CGGradientRelease(gradient);
CGColorSpaceRelease(colorSpace);
}
答案 0 :(得分：0)
该教程中有两件事您尚未更改。 这一行
//// Frames
CGRect progressIndicatorFrame = CGRectMake(-1, 0, 321, 47);
应该是这样的
//// Frames
CGRect progressIndicatorFrame = rect;
这一行
//// Abstracted Attributes
CGRect progressTrackActiveRect = CGRectMake(CGRectGetMinX(activeProgressFrame) + 4, CGRectGetMinY(activeProgressFrame) + 5, CGRectGetWidth(activeProgressFrame) - 8, 10);
应该是这样的
//// Abstracted Attributes
CGRect progressTrackActiveRect = CGRectMake(CGRectGetMinX(activeProgressFrame) + 4, CGRectGetMinY(activeProgressFrame) + 5, (CGRectGetWidth(activeProgressFrame) - 8) * self.progress, 10);
此外，如果您使用的是iOS 7，则需要从UIProgressView子类中删除所有子视图。我正在使用IB，所以我的initWithCoder：方法看起来像这样：
-(id)initWithCoder:(NSCoder *)aDecoder {
self = [super initWithCoder:aDecoder];
if(self) {
NSArray *subViews = self.subviews;
for(UIView *view in subViews) {
[view removeFromSuperview];
}
}
return self;
}
如果没有，您将在自定义进度条上叠加默认的进度条。