ios - UISlider setMaximumTrackTintColor

Question

我正在尝试动态配置 UISlider 上的轨道颜色。

这行代码非常适合设置 slider 轨道的低端。

[self.sliderBar setMinimumTrackTintColor:[UIColor redColor]];

当尝试对 slider 轨道的高端执行相同操作时，这行代码向调试日志报告了 3 个 fatal error 。

[self.sliderBar setMaximumTrackTintColor:[UIColor redColor]];

<Error>: CGContextAddPath: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context  and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.

<Error>: clip: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context  and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.

<Error>: CGContextDrawLinearGradient: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context  and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.

我也曾尝试使用点符号设置轨道色调颜色，但报告了相同的 3 个错误。

self.sliderBar.maximumTrackTintColor = [UIColor redColor];

我很困惑为什么最小轨道色调颜色设置正确，而最大轨道色调颜色却被破坏了。任何帮助将不胜感激。

这个问题似乎与this有关问题，但我不是 100% 确定，因为我没有使用图形(仅设置色调颜色)。

Answer 1

这很奇怪，最小值和最大值对我来说都很好，我什至可以让它动画化颜色变化。我只能建议重新创建 slider 和@synthesize。

@synthesize slider;

- (void)viewDidLoad
{
[super viewDidLoad];
[slider setMinimumTrackTintColor:[UIColor orangeColor]];
[slider setMaximumTrackTintColor:[UIColor blueColor]];



// Do any additional setup after loading the view, typically from a nib.
}