iOS经常使用类别

我们发现，慢慢积累了很多自己写的各种类别的。

。今天，无私。张贴

1.NSDateFomatter

@interface NSDateFormatter (MyCategory)

+ (id)dateFormatter;
+ (id)dateFormatterWithFormat:(NSString *)dateFormat;

+ (id)defaultDateFormatter;

@end

@implementation NSDateFormatter (MyCategory)

+ (id)dateFormatter
{
    return [[self alloc] init];
}

+ (id)dateFormatterWithFormat:(NSString *)dateFormat
{
    NSDateFormatter *dateFormatter = [[self alloc] init];
    dateFormatter.dateFormat = dateFormat;
    return dateFormatter;
}

+ (id)defaultDateFormatter
{
    return [self dateFormatterWithFormat:@"yyyy-MM-dd HH:mm:ss"];
}

@end

2.NSDate

@interface NSDate (MyCategory)

- (NSString *)timeIntervalDescription;//距离当前的时间间隔
- (NSString *)minuteDescription;//精确到分钟的日期
- (NSString *)formattedDateDescription;//格式化日期

@end

@implementation NSDate (MyCategory)

- (NSString *)timeIntervalDescription
{
    NSTimeInterval timeInterval = -[self timeIntervalSinceNow];
	if (timeInterval < 60) {
        return @"1分钟内";
	} else if (timeInterval < 3600) {
        return [NSString stringWithFormat:@"%.f分钟前", timeInterval / 60];
	} else if (timeInterval < 86400) {
        return [NSString stringWithFormat:@"%.f小时前", timeInterval / 3600];
	} else if (timeInterval < 2592000) {//30天内
        return [NSString stringWithFormat:@"%.f天前", timeInterval / 86400];
    } else if (timeInterval < 31536000) {//30天至1年内
        NSDateFormatter *dateFormatter = [NSDateFormatter dateFormatterWithFormat:@"M月d日"];
        return [dateFormatter stringFromDate:self];
    } else {
        return [NSString stringWithFormat:@"%.f年前", timeInterval / 31536000];
    }
}

- (NSString *)minuteDescription
{
    NSDateFormatter *dateFormatter = [NSDateFormatter dateFormatterWithFormat:@"yyyy-MM-dd"];

	NSString *theDay = [dateFormatter stringFromDate:self];//日期的年月日
	NSString *currentDay = [dateFormatter stringFromDate:[NSDate date]];//当前年月日
    if ([theDay isEqualToString:currentDay]) {//当天
		[dateFormatter setDateFormat:@"ah:mm"];
        return [dateFormatter stringFromDate:self];
	} else if ([[dateFormatter dateFromString:currentDay] timeIntervalSinceDate:[dateFormatter dateFromString:theDay]] == 86400) {//昨天
        [dateFormatter setDateFormat:@"ah:mm"];
        return [NSString stringWithFormat:@"昨天 %@", [dateFormatter stringFromDate:self]];
    } else if ([[dateFormatter dateFromString:currentDay] timeIntervalSinceDate:[dateFormatter dateFromString:theDay]] < 86400 * 7) {//间隔一周内
        [dateFormatter setDateFormat:@"EEEE ah:mm"];
        return [dateFormatter stringFromDate:self];
    } else {//曾经
		[dateFormatter setDateFormat:@"yyyy-MM-dd ah:mm"];
        return [dateFormatter stringFromDate:self];
	}
}

- (NSString *)formattedDateDescription
{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

	[dateFormatter setDateFormat:@"yyyy-MM-dd"];
	NSString *theDay = [dateFormatter stringFromDate:self];//日期的年月日
	NSString *currentDay = [dateFormatter stringFromDate:[NSDate date]];//当前年月日

    NSInteger timeInterval = -[self timeIntervalSinceNow];
    if (timeInterval < 60) {
        return @"1分钟内";
	} else if (timeInterval < 3600) {//1小时内
        return [NSString stringWithFormat:@"%d分钟前", timeInterval / 60];
	} else if (timeInterval < 21600) {//6小时内
        return [NSString stringWithFormat:@"%d小时前", timeInterval / 3600];
	} else if ([theDay isEqualToString:currentDay]) {//当天
		[dateFormatter setDateFormat:@"HH:mm"];
        return [NSString stringWithFormat:@"今天 %@", [dateFormatter stringFromDate:self]];
	} else if ([[dateFormatter dateFromString:currentDay] timeIntervalSinceDate:[dateFormatter dateFromString:theDay]] == 86400) {//昨天
        [dateFormatter setDateFormat:@"HH:mm"];
        return [NSString stringWithFormat:@"昨天 %@", [dateFormatter stringFromDate:self]];
    } else {//曾经
		[dateFormatter setDateFormat:@"MM-dd HH:mm"];
        return [dateFormatter stringFromDate:self];
	}
}

@end

3.UIColor

@interface UIColor (MyCategory)

+ (UIColor *)colorWithHexRGB:(NSString *)hexRGBString;

@end

@implementation UIColor (MyCategory)

/*由16进制字符串获取颜色*/
+ (UIColor *)colorWithHexRGB:(NSString *)hexRGBString
{

    if ([hexRGBString hasPrefix:@"#"]) {

        hexRGBString = [hexRGBString substringFromIndex:1];
    }
    unsigned int colorCode = 0;
    unsigned char redByte, greenByte, blueByte;

    if (hexRGBString) {
        NSScanner *scanner = [NSScanner scannerWithString:hexRGBString];
        [scanner scanHexInt:&colorCode];
    }
    redByte = (unsigned char) (colorCode >> 16);
    greenByte = (unsigned char) (colorCode >> 8);
    blueByte = (unsigned char) (colorCode); // masks off high bits

    return [UIColor colorWithRed:(float)redByte/0xff green:(float)greenByte/0xff blue:(float)blueByte/0xff alpha:1.0];
}
@end

4.UIImage

@interface UIImage (MyCategory)
//图片拉伸、平铺接口
- (UIImage *)resizableImageWithCompatibleCapInsets:(UIEdgeInsets)capInsets resizingMode:(UIImageResizingMode)resizingMode;
//图片以ScaleToFit方式拉伸后的CGSize
- (CGSize)sizeOfScaleToFit:(CGSize)scaledSize;

//将图片转向调整为向上
- (UIImage *)fixOrientation;

//以ScaleToFit方式压缩图片
- (UIImage *)compressedImageWithSize:(CGSize)compressedSize;

@end

@implementation UIImage (MyCategory)
/*获取当前主题包的指定图片*/
+ (UIImage *)themeImageNamed:(NSString *)name
{
    NSUInteger themeID = [[ViewManager defaultManager] themeID];
    if (themeID == 0) {//默认主题
        NSString *fileName = [NSString stringWithFormat:@"Lianxi.bundle/Images/%@", name];
        return [self imageNamed:fileName];
    } else {//下载主题
        return nil;
    }
}

/*图片拉伸、平铺接口。兼容iOS5+*/
- (UIImage *)resizableImageWithCompatibleCapInsets:(UIEdgeInsets)capInsets resizingMode:(UIImageResizingMode)resizingMode
{
    CGFloat version = [[[UIDevice currentDevice] systemVersion] floatValue];
    if (version >= 6.0) {
        return [self resizableImageWithCapInsets:capInsets resizingMode:resizingMode];
    } else if (version >= 5.0) {
        if (resizingMode == UIImageResizingModeStretch) {
            return [self stretchableImageWithLeftCapWidth:capInsets.left topCapHeight:capInsets.top];
        } else {//UIImageResizingModeTile
            return [self resizableImageWithCapInsets:capInsets];
        }
    } else {
        return [self stretchableImageWithLeftCapWidth:capInsets.left topCapHeight:capInsets.top];
    }
}

/*图片以ScaleToFit方式拉伸后的CGSize*/
- (CGSize)sizeOfScaleToFit:(CGSize)scaledSize
{
    CGFloat scaleFactor = scaledSize.width / scaledSize.height;
    CGFloat imageFactor = self.size.width / self.size.height;
    if (scaleFactor <= imageFactor) {//图片横向填充
        return CGSizeMake(scaledSize.width, scaledSize.width / imageFactor);
    } else {//纵向填充
        return CGSizeMake(scaledSize.height * imageFactor, scaledSize.height);
    }
}

/*将图片转向调整为向上*/
- (UIImage *)fixOrientation
{
    if (self.imageOrientation == UIImageOrientationUp) {
        return self;
    }

    UIGraphicsBeginImageContextWithOptions(self.size, NO, self.scale);
    [self drawInRect:CGRectMake(0.0, 0.0, self.size.width, self.size.height)];

    UIImage *fixedImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return fixedImage;

}
/*以ScaleToFit方式压缩图片*/
- (UIImage *)compressedImageWithSize:(CGSize)compressedSize
{
    if (CGSizeEqualToSize(self.size, CGSizeZero) || (self.size.width <= compressedSize.width && self.size.height <= compressedSize.height)) {//不用压缩
        return self;
    }

    CGSize scaledSize = [self sizeOfScaleToFit:compressedSize];

    //压缩大小。调整转向
    UIGraphicsBeginImageContext(scaledSize);
    [self drawInRect:CGRectMake(0.0, 0.0, scaledSize.width, scaledSize.height)];
    UIImage *compressedImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return compressedImage;
}

@end

5.UIView

@interface UIView (MyCategory)

- (void)startShakeAnimation;//摇动动画
- (void)stopShakeAnimation;
- (void)startRotateAnimation;//360°旋转动画
- (void)stopRotateAnimation;

///截图
- (UIImage *)screenshot;

@property (nonatomic) float top;
@property (nonatomic) float bottom;
@property (nonatomic) float left;
@property (nonatomic) float right;

@end

@implementation UIView (MyCategory)

/*截图*/
- (UIImage *)screenshot
{
    UIGraphicsBeginImageContextWithOptions(self.frame.size, NO, 2.0);
    [self.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return image;
}

#pragma mark - Animation

- (void)startShakeAnimation
{
    CGFloat rotation = 0.05;

    CABasicAnimation *shake = [CABasicAnimation animationWithKeyPath:@"transform"];
    shake.duration = 0.2;
    shake.autoreverses = YES;
    shake.repeatCount = MAXFLOAT;
    shake.removedOnCompletion = NO;
    shake.fromValue = [NSValue valueWithCATransform3D:CATransform3DRotate(self.layer.transform, -rotation, 0.0, 0.0, 1.0)];
    shake.toValue   = [NSValue valueWithCATransform3D:CATransform3DRotate(self.layer.transform,  rotation, 0.0, 0.0, 1.0)];

    [self.layer addAnimation:shake forKey:@"shakeAnimation"];
}

- (void)stopShakeAnimation
{
    [self.layer removeAnimationForKey:@"shakeAnimation"];
}

- (void)startRotateAnimation
{
    CABasicAnimation *shake = [CABasicAnimation animationWithKeyPath:@"transform"];
    shake.duration = 0.5;
    shake.autoreverses = NO;
    shake.repeatCount = MAXFLOAT;
    shake.removedOnCompletion = NO;
    shake.fromValue = [NSValue valueWithCATransform3D:CATransform3DRotate(self.layer.transform, M_PI, 0.0, 0.0, 1.0)];
    shake.toValue   = [NSValue valueWithCATransform3D:CATransform3DRotate(self.layer.transform,  0.0, 0.0, 0.0, 1.0)];

    [self.layer addAnimation:shake forKey:@"rotateAnimation"];
}

- (void)stopRotateAnimation
{
    [self.layer removeAnimationForKey:@"rotateAnimation"];
}

-(float)top
{
    return self.frame.origin.x;
}
-(float)bottom
{
    return self.top+self.frame.size.height;
}
-(float)left
{
    return self.frame.origin.x;
}
-(float)right
{
    return self.left+self.frame.size.width;
}

@end

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