如何检测iOS设备是否支持模糊效果?

时间:2013-10-16 19:29:56

标签: iphone ios ipad ios7

似乎不同的iOS设备以UINavigationBarbarStyle = UIBarStyleBlack呈现translucent = YES的方式非常不同。考虑:

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, tinted

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

iPhone 5在没有色调的情况下产生所需的效果,但4是不透明的。添加半透明色调使4看起来很好,但是拧紧5。

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

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标准化外观?

2 个答案:

答案 0 :(得分:1)

这个UIDevice类别以及观察UIAccessibilityReduceTransparencyStatusDidChangeNotification怎么样?

@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添加#include。

答案 1 :(得分:0)

我认为这个问题就是你想要做的。只是为不同的设备编写条件代码:

Determine device (iPhone, iPod Touch) with iPhone SDK