CATransform3D的m34使用

//
//  ViewController.m
//  StarWars
//
//  Created by YouXianMing on 15/11/3.
//  Copyright © 2015年 YouXianMing. All rights reserved.
//

#import "ViewController.h"
#import "UIView+SetRect.h"

#define DEGREE(d) ((d) * M_PI / 180.0f)

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor blackColor];
    
    // label
    UILabel *label      = [[UILabel alloc] initWithFrame:self.view.bounds];
    label.numberOfLines = 0;
    label.textColor = [UIColor yellowColor];
    label.text          = @"\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nStar Wars\nAn article (abbreviated art) is a word (or prefix or suffix) that is used with a noun to indicate the type of reference being made by the noun. Articles specify grammatical definiteness of the noun, in some languages extending to volume or numerical scope. The articles in the English language are the and a/an, and (in certain contexts) some. ‘An‘ and ‘a‘ are modern forms of the Old English ‘an‘, which in Anglian dialects was the number ‘one‘ (compare ‘on‘, in Saxon dialects) and survived into Modern Scots as the number ‘ane‘. Both ‘on‘ (respelled ‘one‘ by the Normans) and ‘an‘ survived into Modern English, with ‘one‘ used as the number and ‘an‘ (‘a‘, before nouns that begin with a consonant sound) as an indefinite article.\nTraditionally in English, an article is usually considered to be a type of adjective. In some languages, articles are a special part of speech, which cannot easily be combined with other parts of speech. It is also possible for articles to be part of another part of speech category such as a determiner, an English part of speech category that combines articles and demonstratives (such as ‘this‘ and ‘that‘).";
    [label sizeToFit];
    
    // scrollView
    UIScrollView *scrollView   = [[UIScrollView alloc] initWithFrame:self.view.bounds];
    scrollView.backgroundColor = [UIColor blackColor];
    scrollView.contentSize     = CGSizeMake(self.view.width, label.height + self.view.height + 20);
    [self.view addSubview:scrollView];
    [scrollView addSubview:label];
    
    // CATransform3D
    CATransform3D plane_3D     = CATransform3DIdentity;
    plane_3D.m34               = 1.0/ -500;
    plane_3D                   = CATransform3DRotate(plane_3D, DEGREE(30), 1, 0, 0);
    scrollView.layer.transform = plane_3D;
    
    // animation
    [UIView animateWithDuration:30 animations:^{
        
        scrollView.contentOffset = CGPointMake(0, label.height + self.view.height + 20);
    }];
}

@end

//
//  UIView+SetRect.h
//  StarWars
//
//  Created by YouXianMing on 15/11/3.
//  Copyright © 2015年 YouXianMing. All rights reserved.
//

#import "UIView+SetRect.h"

@implementation UIView (SetRect)

#pragma mark Frame

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

- (void)setViewOrigin:(CGPoint)newOrigin
{
    CGRect newFrame = self.frame;
    newFrame.origin = newOrigin;
    self.frame = newFrame;
}

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

- (void)setViewSize:(CGSize)newSize
{
    CGRect newFrame = self.frame;
    newFrame.size = newSize;
    self.frame = newFrame;
}


#pragma mark Frame Origin

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

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

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

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


#pragma mark Frame Size

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

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

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

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


#pragma mark Frame Borders

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

- (void)setLeft:(CGFloat)left
{
    self.x = left;
}

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

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

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

- (void)setTop:(CGFloat)top
{
    self.y = top;
}

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

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


#pragma mark Center Point

#if !IS_IOS_DEVICE
- (CGPoint)center
{
    return CGPointMake(self.left + self.middleX, self.top + self.middleY);
}

- (void)setCenter:(CGPoint)newCenter
{
    self.left = newCenter.x - self.middleX;
    self.top = newCenter.y - self.middleY;
}
#endif

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

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

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

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


#pragma mark Middle Point

- (CGPoint)middlePoint
{
    return CGPointMake(self.middleX, self.middleY);
}

- (CGFloat)middleX
{
    return self.width / 2;
}

- (CGFloat)middleY
{
    return self.height / 2;
}

@end

//
//  UIView+SetRect.m
//  StarWars
//
//  Created by YouXianMing on 15/11/3.
//  Copyright © 2015年 YouXianMing. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface UIView (SetRect)

// Frame
@property (nonatomic) CGPoint viewOrigin;
@property (nonatomic) CGSize  viewSize;

// Frame Origin
@property (nonatomic) CGFloat x;
@property (nonatomic) CGFloat y;

// Frame Size
@property (nonatomic) CGFloat width;
@property (nonatomic) CGFloat height;

// Frame Borders
@property (nonatomic) CGFloat top;
@property (nonatomic) CGFloat left;
@property (nonatomic) CGFloat bottom;
@property (nonatomic) CGFloat right;

// Center Point
#if !IS_IOS_DEVICE
@property (nonatomic) CGPoint center;
#endif
@property (nonatomic) CGFloat centerX;
@property (nonatomic) CGFloat centerY;

// Middle Point
@property (nonatomic, readonly) CGPoint middlePoint;
@property (nonatomic, readonly) CGFloat middleX;
@property (nonatomic, readonly) CGFloat middleY;
@end