对UIImage添加了一个category
UIImage+Rotation.h
#import <UIKit/UIKit.h>
@interface UIImage (Rotation)
- (UIImage *)imageRotatedByRadians:(CGFloat)radians;
- (UIImage *)imageRotatedByDegrees:(CGFloat)degrees;
@end
UIImage+Rotation.m
#import "UIImage+Rotation.h"
/************
角度=弧度/Pi*180
弧度=角度/180*Pi
*************/
CGFloat DegreesToRadians(CGFloat degrees) {return degrees * M_PI / 180;};
CGFloat RadiansToDegrees(CGFloat radians) {return radians * 180/M_PI;};
@implementation UIImage (Rotation)
- (UIImage *)imageRotatedByRadians:(CGFloat)radians
{
return [self imageRotatedByDegrees:RadiansToDegrees(radians)];
}
- (UIImage *)imageRotatedByDegrees:(CGFloat)degrees
{
/*****
CGAffineTransformMakeRotation
通过指定角度来创建一个旋转矩阵
CGAffineTransformRotate
在已存在的矩阵中使用旋转
*****/
UIView *rotatedViewBox = [[UIView alloc] initWithFrame:CGRectMake(0,0,self.size.width, self.size.height)];
CGAffineTransform t = CGAffineTransformMakeRotation(DegreesToRadians(degrees));
//给view旋转角度
rotatedViewBox.transform = t;
CGSize rotatedSize = rotatedViewBox.frame.size;
[rotatedViewBox release];
//开始编辑图形上下文
UIGraphicsBeginImageContext(rotatedSize);
//定义一个图形上下文
CGContextRef bitmap = UIGraphicsGetCurrentContext();
//沿x轴移动rotatedSize.width/2，y轴移动rotatedSize.height
CGContextTranslateCTM(bitmap, rotatedSize.width/2, rotatedSize.height/2);
//以原点(左下角)为中心旋转DegreesToRadians(degrees)弧度,正角度逆时针，负角度顺时针
CGContextRotateCTM(bitmap, DegreesToRadians(degrees));
//缩放x轴，y轴方向
CGContextScaleCTM(bitmap, 1.0, -1.0);
//绘制位图
CGContextDrawImage(bitmap, CGRectMake(-self.size.width / 2, -self.size.height / 2, self.size.width, self.size.height), [self CGImage]);
//赋值给UIImage
UIImage *resImage = UIGraphicsGetImageFromCurrentImageContext();
//结束绘制
UIGraphicsEndImageContext();
return resImage;
}
@end;
ViewController.m
#import "ViewController.h"
#import <QuartzCore/QuartzCore.h>
#import "ImagecropperView.h"
@interface ViewController ()<ImageCropperDelegate>{
}
@property (nonatomic, retain) IBOutlet ImageCropperView *cropper;
@property (nonatomic, retain) IBOutlet UIImageView *result;
@property (retain, nonatomic) IBOutlet UIImageView *resultSecond;
@property (nonatomic, retain) IBOutlet UIButton *btn;
@property (retain, nonatomic) IBOutlet ImageCropperView *cropperSecond;
@property (retain, nonatomic) IBOutlet UIButton *cropButton;
@end
@implementation ViewController
//@synthesize cropper, result, btn;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
_cropper.layer.borderWidth = 1.0;
_cropper.layer.borderColor = [UIColor blueColor].CGColor;
_cropper.delegate = self;
[_cropper setup];
_cropper.image = [UIImage imageNamed:@"2.jpg"];
[_btn addTarget:self action:@selector(buttonClicked) forControlEvents:UIControlEventTouchUpInside];
_cropperSecond.layer.borderColor = [UIColor blackColor].CGColor;
_cropperSecond.layer.borderWidth = 2.0;
_cropperSecond.delegate = self;
[_cropperSecond setup];
_cropperSecond.image = [UIImage imageNamed:@"1.jpg"];
[_cropButton addTarget:self action:@selector(tapCropButton) forControlEvents:UIControlEventTouchUpInside];
}
- (void)buttonClicked
{
if ([_btn.currentTitle isEqualToString:@"Crop1"]) {
[_cropper finishCropping];//保存
_result.image = _cropper.croppedImage;
_cropper.hidden = YES;
[_btn setTitle:@"Back" forState:UIControlStateNormal];
[_btn setTitle:@"Back" forState:UIControlStateHighlighted];
}else
{
[_cropper reset];
_cropper.hidden = NO;
[_btn setTitle:@"Crop1" forState:UIControlStateNormal];
[_btn setTitle:@"Crop1" forState:UIControlStateHighlighted];
_result.image = nil;
}
_cropperSecond.enable = YES;
_cropper.enable = YES;
}
- (void)tapCropButton{
if ([_cropButton.currentTitle isEqualToString:@"Crop2"]) {
[_cropperSecond finishCropping];
_cropperSecond.enable = NO;
_resultSecond.image = _cropperSecond.croppedImage;
_cropperSecond.hidden = YES;
[_cropButton setTitle:@"Back" forState:UIControlStateNormal];
[_cropButton setTitle:@"Back" forState:UIControlStateHighlighted];
}else
{
[_cropperSecond reset];
_cropperSecond.hidden = NO;
[_cropButton setTitle:@"Crop2" forState:UIControlStateNormal];
[_cropButton setTitle:@"Crop2" forState:UIControlStateHighlighted];
_resultSecond.image = nil;
}
_cropperSecond.enable = YES;
_cropper.enable = YES;
}
#pragma mark - ImageCropperDelegate
- (void)changeMoveStateWithCropper:(UIPanGestureRecognizer*)gesture Crop:(ImageCropperView*)imageCrop{
if (gesture.state == UIGestureRecognizerStateEnded) {
NSLog(@"点击编辑器结束,两个_cropper都可以进行编辑");
_cropperSecond.enable = YES;
_cropper.enable = YES;
}
}
- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event;
{
//判断点击在控件上
UITouch *touch = [touches anyObject];
if ([_cropper pointInside:[touch locationInView:_cropper] withEvent:nil]) {
NSLog(@"_cropper1 被触摸，禁用_cropper2");
_cropperSecond.enable = NO;
}else if ([_cropperSecond pointInside:[touch locationInView:_cropperSecond] withEvent:nil]){
NSLog(@"_cropper2 被触摸,禁用_cropper1");
_cropper.enable = NO;
}
}
- (void)dealloc {
[_cropperSecond release];
[_cropButton release];
[_resultSecond release];
[super dealloc];
}
- (void)viewDidUnload {
[self setCropperSecond:nil];
[self setCropButton:nil];
[self setResultSecond:nil];
[super viewDidUnload];
}
@end
