[心得] UIDevice - system version number

看板MacDev作者whitefur (白毛)時間11年前 (2014/04/28 17:43)推噓0(0推 0噓 0→)

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由於iOS 6 & 7有很多行為不同甚至iOS 7.0 與 iOS 7.1也有不同的行為 ex1: UINavigationBar 在iOS 6 tintColor 會作用到整條bar 但在iOS 7 則拆成 tintColor & barTintColor ======= ex2: UITextView - scrollEnabled = NO時會自動產生NSContentSizeLayoutConstraint 2014-03-13 12:45:57.089 weiwha[2877:90b] contraint: ( "<NSContentSizeLayoutConstraint:0x116d6b850 H:[BubbleTextView:0x10e992080(132)] Hug:250 CompressionResistance:750>", "<NSContentSizeLayoutConstraint:0x116d6b8b0 V:[BubbleTextView:0x10e992080(49)] Hug:250 CompressionResistance:750>" )) scrollEnabled = YES 則不會有NSContentSizeLayoutConstraint 而此情形只在iOS 7.1出現 ===== 於是為了要方便判斷iOS版本我寫了一個UIDevice category UIDevice 原來內建的 -systemVersion 為major.minor.build(ex:7.1.0)形式的NSString 我把它轉成major.minor的float(ex:7.1) 以方便比較版本 source code on github: https://gist.github.com/WhiteFur/11366381 usage: if([UIDevice currentDevice].sysVerNum >= 7.1) //...do what you want.... ============= source code: - (float)sysVerNum{ static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ NSString *sysVerStr = [UIDevice currentDevice].systemVersion; NSError *error = nil; NSRegularExpression *regexp = [NSRegularExpression regularExpressionWithPattern:@"\\d.\\d" options:0 error:&error]; if(error) NSLog(@"UIDevice+SysVerNum sysVerNum regexp error: %@", error); else{ NSTextCheckingResult *result = [regexp firstMatchInString:sysVerStr options:0 range:NSMakeRange(0, [sysVerStr length])]; NSString *resultStr = [sysVerStr substringWithRange:result.range]; NSNumberFormatter *numFormatter = [[NSNumberFormatter alloc] init]; numFormatter.numberStyle = NSNumberFormatterDecimalStyle; NSNumber *sysVerNum = [numFormatter numberFromString:resultStr]; objc_setAssociatedObject(self, &SYS_VER_NUM_KEY, sysVerNum, OBJC_ASSOCIATION_RETAIN); } }); NSNumber *verNum = objc_getAssociatedObject(self, &SYS_VER_NUM_KEY); return [verNum floatValue]; } -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 61.230.134.129 ※ 文章網址: http://www.ptt.cc/bbs/MacDev/M.1398678215.A.753.html ※ 編輯: whitefur (61.230.134.129), 04/28/2014 18:02:42