如何检测iOS设备是否支持模糊效果？ [英] How can I detect if an iOS device supports the blur effect?

问题描述

看来不同的iOS设备使用 barStyle = UIBarStyleBlack 和半透明渲染 UINavigationBar = YES 非常不同。考虑：

It appears that different iOS devices render UINavigationBars with barStyle = UIBarStyleBlack and translucent = YES very differently. Consider:

iPhone 4，没有色调：

iPhone 4, no tint:

iPhone 5，没有色调：

iPhone 5, no tint:

iPhone 4， barTintColor = [UIColor colorWithWhite：0.0f alpha：0.5f ] ：

iPhone 4, barTintColor = [UIColor colorWithWhite:0.0f alpha:0.5f]:

iPhone 5， barTintColor = [UIColor colorWithWhite：0.0f alpha：0.5f] ：

iPhone 5, barTintColor = [UIColor colorWithWhite:0.0f alpha:0.5f]:

iPhone 5产生没有色调的效果，但是4是不透明的。添加一个半透明的色调使4看起来很好，但拧紧5。

The iPhone 5 produces the desired effect without a tint, but the 4 is opaque. Adding a semitransparent tint makes the 4 look good, but screws up the 5.

iPad 2和3也是如此，理论上任何不支持的设备都是如此iOS 7模糊效果。

The same holds true for the iPad 2 and 3, and theoretically any device that does not support the iOS 7 blur effects.

如果没有将这些旧设备列入黑名单，我如何检测设备是否支持模糊，以便我可以有条件地解决渲染差异？或者有没有办法在不使用色调的情况下规范化外观？

Short of blacklisting these older devices, how can I detect if a device supports the blurring so that I can conditionally work around the rendering differences? Or is there a way to normalize the appearance without using a tint at all?

推荐答案

这个UIDevice类别如何以及观察UIAccessibilityReduceTransparencyStatusDidChangeNotification？

What about this UIDevice category along with observing for UIAccessibilityReduceTransparencyStatusDidChangeNotification?

@interface UIDevice (Additions)

@property (readonly) NSString *platform;
@property (readonly) BOOL canBlur;

@end


@implementation UIDevice (Additions)

- (NSString *)platform {
    int mib[] = { CTL_HW, HW_MACHINE };
    size_t len = 0;
    sysctl(mib, 2, NULL, &len, NULL, 0);
    char *machine = malloc(len);
    sysctl(mib, 2, machine, &len, NULL, 0);
    NSString *platform = [NSString stringWithCString:machine encoding:NSASCIIStringEncoding];
    free(machine);

    return platform;
}

- (BOOL)canBlur {
    if(NSStringFromClass([UIVisualEffectView class]) && UIDevice.currentDevice.systemVersion.floatValue >= 8.0 && !UIAccessibilityIsReduceTransparencyEnabled()) {
        NSString *platform = self.platform;
        CGFloat deviceVersion = [[[platform stringByReplacingOccurrencesOfString:@"[^0-9,.]" withString:@"" options:NSRegularExpressionSearch range:NSMakeRange(0, platform.length)] stringByReplacingOccurrencesOfString:@"," withString:@"."] floatValue];

        if([platform isEqualToString:@"i386"] || [platform isEqualToString:@"x86_64"]) {
            return YES;
        } else if([platform rangeOfString:@"iPhone"].location != NSNotFound) {
            return (deviceVersion >= 4.1);
        } else if([platform rangeOfString:@"iPod"].location != NSNotFound) {
            return (deviceVersion >= 5.1);
        } else if([platform rangeOfString:@"iPad"].location != NSNotFound) {
            return (deviceVersion >= 3.4);
        }
    }

    return NO;
}

不要忘记在实施文件中使用#include。

Don't forget to #include in your implementation file.

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