旋转和缩放视图

1.说明

UIView的属性transform属性翻转或放缩视图

2.实例

起：在屏幕上方设置UIImageVIew区域，此区域显示一副图片。下方设置4个按钮，分别是旋转、扩大、缩小、反转

终：4个按钮对应4个方法

- (void)rotateDidPush 以90度为单位旋转

- (void)bigDidPush 以0.1为单位扩大

- (void)smallDidPush 以0.1为单位缩小

- (void)invertDidPush 左右反转

.h

#import <UIKit/UIKit.h>

@interface UIKitPrjFrame : UIViewController {

@private

UIView * _imageView;

CGFloat _rotate;

CGFloat _scale;

bool _needFlip;

}

@end

.m

#import "UIKitPrjFrame.h"

@interface UIKitPrjFrame ()

- (void)rotateDidPush;

- (void)bigDidPush;

- (void)smallDidPush;

- (void)invertDidPush;

- (void)transformWithAnimation;

@end

@implementation UIKitPrjFrame

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view.

_rotate = 0.0;

_scale = 1.0;

_needFlip = NO;

self.view.backgroundColor = [UIColor blackColor];

NSString * path = [NSString stringWithFormat:@"%@/%@",[[NSBundle mainBundle] resourcePath],@"five.jpg"];

UIImage * image = [[UIImage alloc] initWithContentsOfFile:path];

_imageView = [[UIImageView alloc] initWithImage:image];

CGPoint newPoint = self.view.center;

newPoint.y = self.view.center.y - 60;

_imageView.center = newPoint;

[self.view addSubview:_imageView];

UIButton *rotateButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

rotateButton.frame = CGRectMake(0, 0, 50, 40);

newPoint = self.view.center;

newPoint.x -= 75;

newPoint.y = self.view.frame.size.height - 70;

rotateButton.center = newPoint;

[rotateButton setTitle:@"旋转" forState:UIControlStateNormal];

[rotateButton addTarget:self action:@selector(rotateDidPush) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:rotateButton];

UIButton *bigButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

bigButton.frame = rotateButton.frame;

newPoint = self.view.center;

newPoint.x -= 25;

newPoint.y = self.view.frame.size.height - 70;

bigButton.center = newPoint;

[bigButton setTitle:@"扩大" forState:UIControlStateNormal];

[bigButton addTarget:self action:@selector(bigDidPush) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:bigButton];

UIButton *smallButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

smallButton.frame = rotateButton.frame;

newPoint = self.view.center;

newPoint.x += 25;

newPoint.y = self.view.frame.size.height - 70;

smallButton.center = newPoint;

[smallButton setTitle:@"缩小" forState:UIControlStateNormal];

[smallButton addTarget:self action:@selector(smallDidPush) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:smallButton];

UIButton *invertButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

invertButton.frame = rotateButton.frame;

newPoint = self.view.center;

newPoint.x += 75;

newPoint.y = self.view.frame.size.height - 70;

invertButton.center = newPoint;

[invertButton setTitle:@"反转" forState:UIControlStateNormal];

[invertButton addTarget:self action:@selector(invertDidPush) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:invertButton];

}

- (void)transformWithAnimation {

[UIView beginAnimations:nil context:NULL];

CGAffineTransform transformRotate = CGAffineTransformMakeRotation(_rotate * (M_PI / 180.0));

CGAffineTransform transformScale = CGAffineTransformMakeScale(_scale, _scale);

CGAffineTransform transformAll = CGAffineTransformConcat(transformRotate, transformScale);

if (_needFlip) {

transformAll = CGAffineTransformScale(transformAll, -1.0, 1.0);

}

_imageView.transform = transformAll;

[UIView commitAnimations];

}

- (void)rotateDidPush {

_rotate += 90.0;

if (_rotate >= 360) {

_rotate = 0.0;

}

[self transformWithAnimation];

}

- (void)bigDidPush {

_scale += 0.1;

[self transformWithAnimation];

}

- (void)smallDidPush {

_scale -= 0.1;

[self transformWithAnimation];

}

- (void)invertDidPush {

_needFlip = !_needFlip;

[self transformWithAnimation];

}