iOS - 工具函数

来源：互联网发布：深圳网络安防培训学校编辑：程序博客网时间：2024/04/26 00:12

1.时间：

取得时间差：

- (double)GetStringTimeDiff:(NSString*)timeS timeE:(NSString*)timeE{    double timeDiff =0.0;        NSDateFormatter *formatters = [[NSDateFormatteralloc] init];    [formatters setDateFormat:@"yyyy-MM-dd HH:mm:ss"];    NSDate *dateS = [formattersdateFromString:timeS];        NSDateFormatter *formatterE = [[NSDateFormatteralloc] init];    [formatterE setDateFormat:@"yyyy-MM-dd HH:mm:ss"];    NSDate *dateE = [formatterEdateFromString:timeE];        timeDiff = [dateE timeIntervalSinceDate:dateS ];        return timeDiff;}

换算成几天几小时几分钟

- (NSString *)timeFormatted:(int)totalSeconds{    int seconds = totalSeconds %60;    int minutes = (totalSeconds /60) % 60;    int hours = totalSeconds /3600;        if (hours <24)    {        return [NSStringstringWithFormat:@"%02d小时:%02d分:%02d秒",hours, minutes, seconds];    }    else    {        int days  = totalSeconds /86400;        int hourss = (totalSeconds /60*60) %24;        int minutess = (totalSeconds /60) % 60;//        int secondss = totalSeconds % 60;        return [NSStringstringWithFormat:@"%02d天:%02d小时:%02d分", days, hourss, minutess];    }}

2.颜色：

合成颜色.

+ (UIColor*)colorWithHexString:(NSString *)color{    NSCharacterSet* set = [NSCharacterSetwhitespaceAndNewlineCharacterSet];    NSString* cString = [[colorstringByTrimmingCharactersInSet:set]uppercaseString];        // String should be 6 or 8 characters    if ([cStringlength] < 6)    {        return [UIColorclearColor];    }        // strip 0X if it appears    if ([cStringhasPrefix:@"0X"])    {        cString = [cString substringFromIndex:2];    }    if ([cStringhasPrefix:@"#"])    {        cString = [cString substringFromIndex:1];    }    if ([cStringlength] != 6)    {        return [UIColorclearColor];    }        // Separate into r, g, b substrings    NSRange range;    range.location =0;    range.length =2;        //r    NSString *rString = [cStringsubstringWithRange:range];        //g    range.location =2;    NSString *gString = [cStringsubstringWithRange:range];        //b    range.location =4;    NSString *bString = [cStringsubstringWithRange:range];        // Scan values    unsignedint red, green, blue, one = 1;    [[NSScannerscannerWithString:rString] scanHexInt:&red];    [[NSScannerscannerWithString:gString] scanHexInt:&green];    [[NSScannerscannerWithString:bString] scanHexInt:&blue];    constfloat r = (((float)red)   /255.0f);    constfloat g = (((float)green) /255.0f);    constfloat b = (((float)blue)  /255.0f);    constfloat i = (((float)one));    return [UIColorcolorWithRed:r green:gblue:b alpha:i];}

3.计算高度：

//计算高度NSDictionary *attributes = @{NSFontAttributeName: [UIFont fontWithName:@"HelveticaNeue" size:13]};CGSize contentSize = [chartMessage.content boundingRectWithSize:CGSizeMake(200, MAXFLOAT)                                                        options: NSStringDrawingTruncatesLastVisibleLine |                                                                 NSStringDrawingUsesLineFragmentOrigin |                                                                 NSStringDrawingUsesFontLeading                                                                 attributes:attributes                                                                 context:nil].size;

只要把这一段代码封装好就可以变成一个计算文件Label 宽高的方法了

4.三方alertView库添加参数：

把ZSBlockAlertView这个第三方的库添加了url这个重要参数：

- (void)sdkUpdateTypeWithURL:(NSString *)url cancelButtonTitle:(NSString *)cancelStr sureButtonTitle:(NSString *)sureStr{    ZSBlockAlertView *alert = [[ZSBlockAlertView alloc] initWithTitle:@"游戏更新" message:@"游戏有新版本" delegate:nil cancelButtonTitle:cancelStr otherButtonTitles:sureStr, nil];    [alert setClickHandler:^(NSInteger index) {        if (index == 0) {            NSURL *appstoreURL = [NSURL URLWithString:url];            if([[UIApplication sharedApplication] canOpenURL:appstoreURL])            {                [[UIApplication sharedApplication] openURL:appstoreURL];            }        }    }];    [alert show];}

调用：

[[SYSystemInfo shareSystemInfo] sdkUpdateTypeWithURL:self.forceUpDateUrl cancelButtonTitle:@"立即更新" sureButtonTitle:nil];

5.压缩图片

压缩图片，常常用来上传到服务器！

- (NSData *)imageWithImage:(UIImage*)image          scaledToSize:(CGSize)newSize;{    UIGraphicsBeginImageContext(newSize);    [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];    UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return UIImageJPEGRepresentation(newImage, 0.8);}

0 0