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【深圳达内IOS培训】iOS开发中常用的方法

  • 时间:2016-06-08
  • 发布:达内
  • 来源:达内

深圳ios培训的小编为大家收集了11种四道iOS开发中常用的方法,希望能对你有所帮助!下面快来跟随深圳达内JAVA培训的小编来了解一下吧!
1.//获取字符串(或汉字)首字母

+ (NSString *)firstCharacterWithString:(NSString *)string{
    NSMutableString *str = [NSMutableString stringWithString:string];
    CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformMandarinLatin, NO);
    CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformStripDiacritics, NO);
    NSString *pingyin = [str capitalizedString];
    return [pingyin substringToIndex:1];
}

2.//将字符串数组按照元素首字母顺序进行排序分组
+ (NSDictionary *)dictionaryOrderByCharacterWithOriginalArray:(NSArray *)array{
    if (array.count == 0) {
        return nil;
    }
    for (id obj in array) {
        if (![obj isKindOfClass:[NSString class]]) {
            return nil;
        }
    }
    UILocalizedIndexedCollation *indexedCollation = [UILocalizedIndexedCollation currentCollation];
    NSMutableArray *objects = [NSMutableArray arrayWithCapacity:indexedCollation.sectionTitles.count];
    //创建27个分组数组
    for (int i = 0; i < indexedCollation.sectionTitles.count; i++) {
        NSMutableArray *obj = [NSMutableArray array];
        [objects addObject:obj];
    }
    NSMutableArray *keys = [NSMutableArray arrayWithCapacity:objects.count];
    //按字母顺序进行分组
    NSInteger lastIndex = -1;
    for (int i = 0; i < array.count; i++) {
        NSInteger index = [indexedCollation sectionForObject:array[i] collationStringSelector:@selector(uppercaseString)];
        [[objects objectAtIndex:index] addObject:array[i]];
        lastIndex = index;
    }
    //去掉空数组
    for (int i = 0; i < objects.count; i++) {
        NSMutableArray *obj = objects[i];
        if (obj.count == 0) {
            [objects removeObject:obj];
        }
    }
    //获取索引字母
    for (NSMutableArray *obj in objects) {
        NSString *str = obj[0];
        NSString *key = [self firstCharacterWithString:str];
        [keys addObject:key];
    }
    NSMutableDictionary *dic = [NSMutableDictionary dictionary];
    [dic setObject:objects forKey:keys];
    return dic;
}
 
//获取字符串(或汉字)首字母
+ (NSString *)firstCharacterWithString:(NSString *)string{
    NSMutableString *str = [NSMutableString stringWithString:string];
    CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformMandarinLatin, NO);
    CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformStripDiacritics, NO);
    NSString *pingyin = [str capitalizedString];
    return [pingyin substringToIndex:1];
}
3.//获取当前时间
//format: @"yyyy-MM-dd HH:mm:ss"、@"yyyy年MM月dd日 HH时mm分ss秒"
+ (NSString *)currentDateWithFormat:(NSString *)format{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:format];
    return [dateFormatter stringFromDate:[NSDate date]];
}
4.//判断手机号码格式是否正确
+ (BOOL)valiMobile:(NSString *)mobile{
    mobile = [mobile stringByReplacingOccurrencesOfString:@" " withString:@""];
    if (mobile.length != 11)
    {
        return NO;
    }else{
        /**
         * 移动号段正则表达式
         */
        NSString *CM_NUM = @"^((13[4-9])|(147)|(15[0-2,7-9])|(178)|(18[2-4,7-8]))\\d{8}|(1705)\\d{7}$";
        /**
         * 联通号段正则表达式
         */
        NSString *CU_NUM = @"^((13[0-2])|(145)|(15[5-6])|(176)|(18[5,6]))\\d{8}|(1709)\\d{7}$";
        /**
         * 电信号段正则表达式
         */
        NSString *CT_NUM = @"^((133)|(153)|(177)|(18[0,1,9]))\\d{8}$";
        NSPredicate *pred1 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM_NUM];
        BOOL isMatch1 = [pred1 evaluateWithObject:mobile];
        NSPredicate *pred2 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU_NUM];
        BOOL isMatch2 = [pred2 evaluateWithObject:mobile];
        NSPredicate *pred3 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT_NUM];
        BOOL isMatch3 = [pred3 evaluateWithObject:mobile];
 
        if (isMatch1 || isMatch2 || isMatch3) {
            return YES;
        }else{
            return NO;
        }
    }
}
5.//利用正则表达式验证
+ (BOOL)isAvailableEmail:(NSString *)email {
    NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
    return [emailTest evaluateWithObject:email];
}
6.//截取view中某个区域生成一张图片
+ (UIImage *)shotWithView:(UIView *)view scope:(CGRect)scope{
    CGImageRef imageRef = CGImageCreateWithImageInRect([self shotWithView:view].CGImage, scope);
    UIGraphicsBeginImageContext(scope.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGRect rect = CGRectMake(0, 0, scope.size.width, scope.size.height);
    CGContextTranslateCTM(context, 0, rect.size.height);//下移
    CGContextScaleCTM(context, 1.0f, -1.0f);//上翻
    CGContextDrawImage(context, rect, imageRef);
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    CGImageRelease(imageRef);
    CGContextRelease(context);
    return image;
}
7.//判断字符串中是否含有某个字符串
+ (BOOL)isHaveSpaceInString:(NSString *)string{
    NSRange _range = [string rangeOfString:@" "];
    if (_range.location != NSNotFound) {
        return YES;
    }else {
        return NO;
    }
}
8.//判断字符串中是否含有中文
+ (BOOL)isHaveChineseInString:(NSString *)string{  
  for(NSInteger i = 0; i < [string length]; i++){
        int a = [string characterAtIndex:i];
        if (a > 0x4e00 && a < 0x9fff) {
            return YES;
        }
    }
    return NO;
}
9.//判断字符串是否全部为数字
+ (BOOL)isAllNum:(NSString *)string{  
    unichar c;
    for (int i=0; i<string.length; i++) {
        c=[string characterAtIndex:i];
        if (!isdigit(c)) {
            return NO;
        }
    }
    return YES;
}
10.//绘制虚线
/*
  ** lineFrame:     虚线的 frame
  ** length:        虚线中短线的宽度
  ** spacing:       虚线中短线之间的间距
  ** color:         虚线中短线的颜色
*/
+ (UIView *)createDashedLineWithFrame:(CGRect)lineFrame
                           lineLength:(int)length
                          lineSpacing:(int)spacing
                            lineColor:(UIColor *)color{
    UIView *dashedLine = [[UIView alloc] initWithFrame:lineFrame];
    dashedLine.backgroundColor = [UIColor clearColor];
    CAShapeLayer *shapeLayer = [CAShapeLayer layer];
    [shapeLayer setBounds:dashedLine.bounds];
    [shapeLayer setPosition:CGPointMake(CGRectGetWidth(dashedLine.frame) / 2, CGRectGetHeight(dashedLine.frame))];
    [shapeLayer setFillColor:[UIColor clearColor].CGColor];
    [shapeLayer setStrokeColor:color.CGColor];
    [shapeLayer setLineWidth:CGRectGetHeight(dashedLine.frame)];
    [shapeLayer setLineJoin:kCALineJoinRound];
    [shapeLayer setLineDashPattern:[NSArray arrayWithObjects:[NSNumber numberWithInt:length], [NSNumber numberWithInt:spacing], nil]];
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, NULL, 0, 0);
    CGPathAddLineToPoint(path, NULL, CGRectGetWidth(dashedLine.frame), 0);
    [shapeLayer setPath:path];
    CGPathRelease(path);
    [dashedLine.layer addSublayer:shapeLayer];
    return dashedLine;
}
11.//压缩图片到指定文件大小
+ (NSData *)compressOriginalImage:(UIImage *)image toMaxDataSizeKBytes:(CGFloat)size{
    NSData *data = UIImageJPEGRepresentation(image, 1.0);
    CGFloat dataKBytes = data.length/1000.0;
    CGFloat maxQuality = 0.9f;
    CGFloat lastData = dataKBytes;
    while (dataKBytes > size && maxQuality > 0.01f) {
        maxQuality = maxQuality - 0.01f;
        data = UIImageJPEGRepresentation(image, maxQuality);
        dataKBytes = data.length/1000.0;
        if (lastData == dataKBytes) {
            break;
        }else{
            lastData = dataKBytes;
        }
    }
    return data;

}

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