UIView Utils Borrowed from Three20 / DTFoundation

UIView+Utils.h

//
//  UIView+Utils.h
//  Borrowed from Three20 / DTFoundation
//
//  Copyright (c) 2013 iOS. No rights reserved.
//

#import <UIKit/UIKit.h>


@interface UIView (Utils)

/**
 * Shortcut for frame.origin.x.
 *
 * Sets frame.origin.x = left
 */
@property (nonatomic) CGFloat left;

/**
 * Shortcut for frame.origin.y
 *
 * Sets frame.origin.y = top
 */
@property (nonatomic) CGFloat top;

/**
 * Shortcut for frame.origin.x + frame.size.width
 *
 * Sets frame.origin.x = right - frame.size.width
 */
@property (nonatomic) CGFloat right;

/**
 * Shortcut for frame.origin.y + frame.size.height
 *
 * Sets frame.origin.y = bottom - frame.size.height
 */
@property (nonatomic) CGFloat bottom;

/**
 * Shortcut for frame.size.width
 *
 * Sets frame.size.width = width
 */
@property (nonatomic) CGFloat width;

/**
 * Shortcut for frame.size.height
 *
 * Sets frame.size.height = height
 */
@property (nonatomic) CGFloat height;

/**
 * Shortcut for center.x
 *
 * Sets center.x = centerX
 */
@property (nonatomic) CGFloat centerX;

/**
 * Shortcut for center.y
 *
 * Sets center.y = centerY
 */
@property (nonatomic) CGFloat centerY;

/**
 * Return the x coordinate on the screen.
 */
@property (nonatomic, readonly) CGFloat screenX;

/**
 * Return the y coordinate on the screen.
 */
@property (nonatomic, readonly) CGFloat screenY;

/**
 * Return the x coordinate on the screen, taking into account scroll views.
 */
@property (nonatomic, readonly) CGFloat screenViewX;

/**
 * Return the y coordinate on the screen, taking into account scroll views.
 */
@property (nonatomic, readonly) CGFloat screenViewY;

/**
 * Return the view frame on the screen, taking into account scroll views.
 */
@property (nonatomic, readonly) CGRect screenFrame;

/**
 * Shortcut for frame.origin
 */
@property (nonatomic) CGPoint origin;

/**
 * Shortcut for frame.size
 */
@property (nonatomic) CGSize size;

/**
 * Return the width in portrait or the height in landscape.
 */
@property (nonatomic, readonly) CGFloat orientationWidth;

/**
 * Return the height in portrait or the width in landscape.
 */
@property (nonatomic, readonly) CGFloat orientationHeight;

/**
 * Finds the first descendant view (including this view) that is a member of a particular class.
 */
- (UIView*)descendantOrSelfWithClass:(Class)cls;

/**
 * Finds the first ancestor view (including this view) that is a member of a particular class.
 */
- (UIView*)ancestorOrSelfWithClass:(Class)cls;

/**
 * Removes all subviews.
 */
- (void)removeAllSubviews;

/**
 Attaches the given block for a single tap action to the receiver.
 @param block The block to execute.
 */
- (void)setTapActionWithBlock:(void (^)(void))block;

/**
 Attaches the given block for a long press action to the receiver.
 @param block The block to execute.
 */
- (void)setLongPressActionWithBlock:(void (^)(void))block;

@end

UIView+Utils.m

//
//  UIView+Utils.m
//  Borrowed from Three20
//
//  Copyright (c) 2013 iOS. No rights reserved.
//

#import "UIView+Utils.h"

#import <objc/runtime.h>

static char kDTActionHandlerTapBlockKey;
static char kDTActionHandlerTapGestureKey;
static char kDTActionHandlerLongPressBlockKey;
static char kDTActionHandlerLongPressGestureKey;

@implementation UIView (Utils)


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

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

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

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

- (CGFloat)right {
    return self.frame.origin.x + self.frame.size.width;
}

- (void)setRight:(CGFloat)right {
    CGRect frame = self.frame;
    frame.origin.x = right - frame.size.width;
    self.frame = frame;
}

- (CGFloat)bottom {
    return self.frame.origin.y + self.frame.size.height;
}

- (void)setBottom:(CGFloat)bottom {
    CGRect frame = self.frame;
    frame.origin.y = bottom - frame.size.height;
    self.frame = frame;
}

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

- (void)setCenterX:(CGFloat)centerX {
    self.center = CGPointMake(centerX, self.center.y);
}

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

- (void)setCenterY:(CGFloat)centerY {
    self.center = CGPointMake(self.center.x, centerY);
}

- (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;
}

- (CGFloat)screenX {
    CGFloat x = 0.0f;
    for (UIView* view = self; view; view = view.superview) {
        x += view.left;
    }
    return x;
}

- (CGFloat)screenY {
    CGFloat y = 0.0f;
    for (UIView* view = self; view; view = view.superview) {
        y += view.top;
    }
    return y;
}

- (CGFloat)screenViewX {
    CGFloat x = 0.0f;
    for (UIView* view = self; view; view = view.superview) {
        x += view.left;

        if ([view isKindOfClass:[UIScrollView class]]) {
            UIScrollView* scrollView = (UIScrollView*)view;
            x -= scrollView.contentOffset.x;
        }
    }

    return x;
}

- (CGFloat)screenViewY {
    CGFloat y = 0;
    for (UIView* view = self; view; view = view.superview) {
        y += view.top;

        if ([view isKindOfClass:[UIScrollView class]]) {
            UIScrollView* scrollView = (UIScrollView*)view;
            y -= scrollView.contentOffset.y;
        }
    }
    return y;
}

- (CGRect)screenFrame {
    return CGRectMake(self.screenViewX, self.screenViewY, self.width, self.height);
}

- (CGPoint)origin {
    return self.frame.origin;
}

- (void)setOrigin:(CGPoint)origin {
    CGRect frame = self.frame;
    frame.origin = origin;
    self.frame = frame;
}

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

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

- (CGFloat)orientationWidth {
    return UIInterfaceOrientationIsLandscape([UIApplication sharedApplication].statusBarOrientation)
    ? self.height : self.width;
}

- (CGFloat)orientationHeight {
    return UIInterfaceOrientationIsLandscape([UIApplication sharedApplication].statusBarOrientation)
    ? self.width : self.height;
}

- (UIView*)descendantOrSelfWithClass:(Class)cls {
    if ([self isKindOfClass:cls])
        return self;

    for (UIView* child in self.subviews) {
        UIView* it = [child descendantOrSelfWithClass:cls];
        if (it)
            return it;
    }

    return nil;
}

- (UIView*)ancestorOrSelfWithClass:(Class)cls {
    if ([self isKindOfClass:cls]) {
        return self;

    } else if (self.superview) {
        return [self.superview ancestorOrSelfWithClass:cls];

    } else {
        return nil;
    }
}

- (void)removeAllSubviews {
    while (self.subviews.count) {
        UIView* child = self.subviews.lastObject;
        [child removeFromSuperview];
    }
}

- (CGPoint)offsetFromView:(UIView*)otherView {
    CGFloat x = 0.0f, y = 0.0f;
    for (UIView* view = self; view && view != otherView; view = view.superview) {
        x += view.left;
        y += view.top;
    }
    return CGPointMake(x, y);
}

- (void)setTapActionWithBlock:(void (^)(void))block
{
	UITapGestureRecognizer *gesture = objc_getAssociatedObject(self, &kDTActionHandlerTapGestureKey);

	if (!gesture)
	{
		gesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(__handleActionForTapGesture:)];
		[self addGestureRecognizer:gesture];
		objc_setAssociatedObject(self, &kDTActionHandlerTapGestureKey, gesture, OBJC_ASSOCIATION_RETAIN);
	}

	objc_setAssociatedObject(self, &kDTActionHandlerTapBlockKey, block, OBJC_ASSOCIATION_COPY);
}

- (void)__handleActionForTapGesture:(UITapGestureRecognizer *)gesture
{
	if (gesture.state == UIGestureRecognizerStateRecognized)
	{
		void(^action)(void) = objc_getAssociatedObject(self, &kDTActionHandlerTapBlockKey);

		if (action)
		{
			action();
		}
	}
}

- (void)setLongPressActionWithBlock:(void (^)(void))block
{
	UILongPressGestureRecognizer *gesture = objc_getAssociatedObject(self, &kDTActionHandlerLongPressGestureKey);

	if (!gesture)
	{
		gesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(__handleActionForLongPressGesture:)];
		[self addGestureRecognizer:gesture];
		objc_setAssociatedObject(self, &kDTActionHandlerLongPressGestureKey, gesture, OBJC_ASSOCIATION_RETAIN);
	}

	objc_setAssociatedObject(self, &kDTActionHandlerLongPressBlockKey, block, OBJC_ASSOCIATION_COPY);
}

- (void)__handleActionForLongPressGesture:(UITapGestureRecognizer *)gesture
{
	if (gesture.state == UIGestureRecognizerStateBegan)
	{
		void(^action)(void) = objc_getAssociatedObject(self, &kDTActionHandlerLongPressBlockKey);

		if (action)
		{
			action();
		}
	}
}

@end