IOS常用分类Category

#import <UIKit/UIKit.h>

@interface UIImage (Extension)
/**
*  不同版本系统适配使用
*/
+ (UIImage *)imageWithName:(NSString *)name;

/**
*  通过颜色来创建一张图片
*/
+ (UIImage *)imageWithColor:(UIColor *)color;

/**
*  将图片切成圆形
*/
+(UIImage*) circleImage:(UIImage*) image withParam:(CGFloat) inset;

#import "UIImage+Extension.h"

@implementation UIImage (Extension)

/**
*  根据图片名，自动适配系统
*/
+ (UIImage *)imageWithName:(NSString *)name
{
    UIImage *image = nil;

    if (iOS8) {
        NSString *newName = [name stringByAppendingString:@"_os8"];
        image = [UIImage imageNamed:newName];
    }

    if (image == nil) {
        image = [UIImage imageNamed:name];
    }
    return image;
}

/**
*  通过颜色来创建一张图片
*/
+ (UIImage *)imageWithColor:(UIColor *)color
{
    CGFloat imageW = 100;
    CGFloat imageH = 100;
    // 1.开启基于位图的图形上下文
    UIGraphicsBeginImageContextWithOptions(CGSizeMake(imageW, imageH), NO, 0.0);

    // 2.画一个color颜色的矩形框
    [color set];
    UIRectFill(CGRectMake(0, 0, imageW, imageH));

    // 3.拿到图片
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

    // 4.关闭上下文
    UIGraphicsEndImageContext();
    return image;
}

/**
*  将图片切成圆形
*/
+(UIImage*) circleImage:(UIImage*) image withParam:(CGFloat) inset {
    UIGraphicsBeginImageContext(image.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetLineWidth(context, 2);
    CGContextSetStrokeColorWithColor(context, [UIColor redColor].CGColor);
    CGRect rect = CGRectMake(inset, inset, image.size.width - inset * 2.0f, image.size.height - inset * 2.0f);
    CGContextAddEllipseInRect(context, rect);
    CGContextClip(context);

    [image drawInRect:rect];
    CGContextAddEllipseInRect(context, rect);
    CGContextStrokePath(context);
    UIImage *newimg = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newimg;
}

@interface UIView (Extension)
@property (nonatomic, assign) CGFloat x;
@property (nonatomic, assign) CGFloat y;
@property (nonatomic, assign) CGFloat centerX;
@property (nonatomic, assign) CGFloat centerY;
@property (nonatomic, assign) CGFloat width;
@property (nonatomic, assign) CGFloat height;
@property (nonatomic, assign) CGSize size;
@end

#import "UIView+Extension.h"

@implementation UIView (Extension)

- (CGFloat)x
{
    return self.frame.origin.x;
}

- (void)setX:(CGFloat)x
{
    CGRect frame = self.frame;
    frame.origin.x = x;
    self.frame = frame;
}

- (CGFloat)y
{
    return self.frame.origin.y;
}

-(void)setY:(CGFloat)y
{
    CGRect frame = self.frame;
    frame.origin.y = y;
    self.frame = frame;
}

- (CGFloat)centerX
{
    return self.center.x;
}

-(void)setCenterX:(CGFloat)centerX
{
    CGPoint center = self.center;
    center.x = centerX;
    self.center = center;
}

- (CGFloat)centerY
{
    return self.center.y;
}

- (void)setCenterY:(CGFloat)centerY
{
    CGPoint center = self.center;
    center.y = centerY;
    self.center = center;
}

- (CGFloat)width
{
    return self.frame.size.width;
}

- (void)setWidth:(CGFloat)width
{
    CGRect frame = self.frame;
    frame.size.width = width;
    self.frame = frame;
}

-(CGFloat)height
{
    return self.frame.size.height;
}

- (void)setHeight:(CGFloat)height
{
    CGRect frame = self.frame;
    frame.size.height = height;
    self.frame = frame;
}

- (CGSize)size
{
    return self.frame.size;
}

- (void)setSize:(CGSize)size
{
    CGRect frame = self.frame;
    frame.size = size;
    self.frame = frame;
}

@interface NSDate (MJ)
/**
*  是否为今天
*/
- (BOOL)isToday;
/**
*  是否为昨天
*/
- (BOOL)isYesterday;
/**
*  是否为今年
*/
- (BOOL)isThisYear;

/**
*  返回一个只有年月日的时间
*/
- (NSDate *)dateWithYMD;

/**
*  获得与当前时间的差距
*/
- (NSDateComponents *)deltaWithNow;
@end

#import "NSDate+MJ.h"

@implementation NSDate (MJ)
/**
*  是否为今天
*/
- (BOOL)isToday
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    int unit = NSCalendarUnitDay | NSCalendarUnitMonth |  NSCalendarUnitYear;

    // 1.获得当前时间的年月日
    NSDateComponents *nowCmps = [calendar components:unit fromDate:[NSDate date]];

    // 2.获得self的年月日
    NSDateComponents *selfCmps = [calendar components:unit fromDate:self];
    return
    (selfCmps.year == nowCmps.year) &&
    (selfCmps.month == nowCmps.month) &&
    (selfCmps.day == nowCmps.day);
}

/**
*  是否为昨天
*/
- (BOOL)isYesterday
{
    // 2014-05-01
    NSDate *nowDate = [[NSDate date] dateWithYMD];

    // 2014-04-30
    NSDate *selfDate = [self dateWithYMD];

    // 获得nowDate和selfDate的差距
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *cmps = [calendar components:NSCalendarUnitDay fromDate:selfDate toDate:nowDate options:0];
    return cmps.day == 1;
}

- (NSDate *)dateWithYMD
{
    NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
    fmt.dateFormat = @"yyyy-MM-dd";
    NSString *selfStr = [fmt stringFromDate:self];
    return [fmt dateFromString:selfStr];
}

/**
*  是否为今年
*/
- (BOOL)isThisYear
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    int unit = NSCalendarUnitYear;

    // 1.获得当前时间的年月日
    NSDateComponents *nowCmps = [calendar components:unit fromDate:[NSDate date]];

    // 2.获得self的年月日
    NSDateComponents *selfCmps = [calendar components:unit fromDate:self];

    return nowCmps.year == selfCmps.year;
}

- (NSDateComponents *)deltaWithNow
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    int unit = NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
    return [calendar components:unit fromDate:self toDate:[NSDate date] options:0];
}

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