我正在使用 GradientLayer 自定义 UIButton。我看到一个性能问题,因为视图加载缓慢并且看起来像一个混蛋效果。改变方向时也一样。我将此代码用于 iPad 应用程序。使用普通 UIButton 可以平滑加载/旋转。
我正在使用在谷歌(GradientButton 类)中找到的示例代码并且工作正常。容器 UIViewController 被推送到导航控制器堆栈以显示屏幕。
这是代码:
- (void)awakeFromNib {
[self initLayers];
}
- (id)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
[self initLayers];
}
return self;
}
- (void)initLayers {
[self initBorder];
[self addShineLayer];
[self addHighlightLayer];
self.clipsToBounds = YES;
}
- (void)initBorder {
CALayer *layer = self.layer;
layer.cornerRadius = 8.0f;
layer.masksToBounds = YES;
layer.borderWidth = 1.0f;
layer.borderColor = [UIColor colorWithWhite:0.5f alpha:0.2f].CGColor;
}
- (void)addShineLayer {
shineLayer = [CAGradientLayer layer];
shineLayer.frame = self.layer.bounds;
shineLayer.colors = [NSArray arrayWithObjects:
(id)[UIColor colorWithWhite:1.0f alpha:0.4f].CGColor,
(id)[UIColor colorWithWhite:1.0f alpha:0.2f].CGColor,
(id)[UIColor colorWithWhite:0.75f alpha:0.2f].CGColor,
(id)[UIColor colorWithWhite:0.4f alpha:0.2f].CGColor,
(id)[UIColor colorWithWhite:1.0f alpha:0.4f].CGColor,
nil];
shineLayer.locations = [NSArray arrayWithObjects:
[NSNumber numberWithFloat:0.0f],
[NSNumber numberWithFloat:0.5f],
[NSNumber numberWithFloat:0.5f],
[NSNumber numberWithFloat:0.8f],
[NSNumber numberWithFloat:1.0f],
nil];
// shineLayer.shouldRasterize = YES;
// shineLayer.rasterizationScale = [UIScreen mainScreen].scale;
[self.layer addSublayer:shineLayer];
}
#pragma mark -
#pragma mark Highlight button while touched
- (void)addHighlightLayer {
highlightLayer = [CALayer layer];
highlightLayer.backgroundColor = [UIColor colorWithRed:0.25f green:0.25f blue:0.25f alpha:0.75].CGColor;
highlightLayer.frame = self.layer.bounds;
highlightLayer.hidden = YES;
[self.layer insertSublayer:highlightLayer below:shineLayer];
}
- (void)setHighlighted:(BOOL)highlight {
highlightLayer.hidden = !highlight;
[super setHighlighted:highlight];
}
性能问题是由于渐变层吗?请告诉我如何纠正这个问题。