Initial commit

2017-08-15 16:59:01 +08:00
commit bdc83e07ef
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+//
+//  WFTailoringViewController.m
+//  WFPhotoPicker
+//
+//  Created by 赚发2 on 16/9/2.
+//  Copyright © 2016年 fengwang. All rights reserved.
+//
+
+#import "WFTailoringViewController.h"
+#import <Photos/Photos.h>
+#import "WFPhotoAlbum.h"
+
+static CGFloat rectWidth = 300;
+static CGFloat rectHeight = 168;
+
+@interface WFTailoringViewController ()
+//原图imageView
+@property (nonatomic, strong) UIImageView *tailorImageView;
+//image
+@property (nonatomic, strong) UIImage *showImage;
+
+@end
+
+@implementation WFTailoringViewController
+
+#pragma mark - UIViewController life cycle -
+- (void)viewDidLoad {
+    [super viewDidLoad];
+    // Do any additional setup after loading the view.
+    
+    [self private_setupViews];
+    [self private_showImage];
+}
+
+#pragma mark - event response -
+- (void)panAction:(UIPanGestureRecognizer *)panGesture{
+    CGFloat width = self.view.frame.size.width;
+    CGFloat height = self.view.frame.size.height;
+    
+    CGPoint translation = [panGesture translationInView:panGesture.view.superview];
+    panGesture.view.center = CGPointMake(panGesture.view.center.x + translation.x,
+                                         panGesture.view.center.y + translation.y);
+    [panGesture setTranslation:CGPointZero inView:panGesture.view.superview];
+    //不能上出选择框
+    if (panGesture.view.frame.origin.x >= (width - rectWidth ) / 2){
+        panGesture.view.frame = CGRectMake((width - rectWidth ) / 2, panGesture.view.frame.origin.y, panGesture.view.frame.size.width, panGesture.view.frame.size.height);
+    };
+    //不能右出选择框
+    if (panGesture.view.frame.origin.y >= (height - rectHeight) / 2) {
+        panGesture.view.frame = CGRectMake(panGesture.view.frame.origin.x, (height - rectHeight) / 2, panGesture.view.frame.size.width, panGesture.view.frame.size.height);
+    }
+    CGFloat scaleH = panGesture.view.frame.size.height;
+    //不能下出选择框
+    if (panGesture.view.frame.origin.y <= -(scaleH - (height - rectHeight) / 2 - rectHeight)) {
+        panGesture.view.frame = CGRectMake(panGesture.view.frame.origin.x, -(scaleH - (height - rectHeight) / 2 - rectHeight) ,panGesture.view.frame.size.width, panGesture.view.frame.size.height);
+    }
+    CGFloat scaleW = panGesture.view.frame.size.width;
+    //不能右出选择框
+    if (panGesture.view.frame.origin.x <= -(scaleW - (width - rectWidth) / 2 - rectWidth)) {
+        panGesture.view.frame = CGRectMake(-(scaleW - (width - rectWidth) / 2 - rectWidth), panGesture.view.frame.origin.y, panGesture.view.frame.size.width, panGesture.view.frame.size.height);
+    }
+}
+
+- (void)pinchAction:(UIPinchGestureRecognizer *)pinchGesture{
+
+    pinchGesture.view.transform = CGAffineTransformScale(pinchGesture.view.transform, pinchGesture.scale, pinchGesture.scale);
+    //确保不能放大过大或过小
+    //2D 矩阵:ad缩放bc旋转tx,ty位移
+    //规则:x=ax+cy+tx
+    //    y=bx+dy+ty
+    if (pinchGesture.view.transform.a > 1.5) {
+        CGAffineTransform transform = pinchGesture.view.transform;
+        transform.a = 1.5;
+        transform.d = 1.5;
+        pinchGesture.view.transform = transform;
+    }
+    if (pinchGesture.view.transform.a < 0.80) {
+        CGAffineTransform transform = pinchGesture.view.transform;
+        transform.a = 0.80;
+        transform.d = 0.80;
+        pinchGesture.view.transform = transform;
+    }
+    pinchGesture.scale = 1;
+}
+
+- (void)sureSelectedImage:(UIButton *)sender{
+    UIImage *image = [self private_captureImageFromView:self.view];
+    _tailoredImage ? _tailoredImage(image) : nil;
+    [self dismissViewControllerAnimated:YES completion:nil];
+}
+
+#pragma mark - private methods -
+- (void)private_setupViews{
+    self.view.backgroundColor = [UIColor blackColor];
+    //选择图片
+    _tailorImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 0)];
+    _tailorImageView.userInteractionEnabled = YES;
+    [self.view addSubview:_tailorImageView];
+    //选择框
+    [self private_setupBoxLayer];
+    
+    UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAction:)];
+    [_tailorImageView addGestureRecognizer:panGesture];
+    
+    UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchAction:)];
+    [_tailorImageView addGestureRecognizer:pinchGesture];
+    //底部视图
+    UIView *toolView = [[UIView alloc] initWithFrame:CGRectMake(0, self.view.frame.size.height - 50, self.view.frame.size.width, 50)];
+    [self.view addSubview:toolView];
+    toolView.backgroundColor = [UIColor whiteColor];
+    
+    UIButton *sureButton = [UIButton buttonWithType:UIButtonTypeCustom];
+    sureButton.frame = CGRectMake(self.view.frame.size.width - 80, 5, 60, 40);
+    sureButton.backgroundColor = [UIColor colorWithRed:110 / 255.0 green:204 / 255.0 blue:245 / 255.0 alpha:1];
+    [sureButton setTitle:@"确定" forState: UIControlStateNormal];
+    [sureButton addTarget:self action:@selector(sureSelectedImage:) forControlEvents:UIControlEventTouchUpInside];
+    sureButton.layer.cornerRadius = 5;
+    sureButton.layer.masksToBounds = YES;
+    [toolView addSubview:sureButton];
+    
+}
+
+- (void)private_setupBoxLayer{
+    
+    CGFloat width = self.view.frame.size.width;
+    CGFloat height = self.view.frame.size.height;
+    
+    [self private_addShapeLayerWithFrame:CGRectMake(0, 0, width, (height - rectHeight) / 2)
+                     strokeColor:[UIColor clearColor]
+                       fillColor:[UIColor colorWithWhite:0.2 alpha:0.2]];
+    [self private_addShapeLayerWithFrame:CGRectMake(0, (height - rectHeight) / 2, (width - rectWidth) / 2, rectHeight)
+                     strokeColor:[UIColor clearColor]
+                       fillColor:[UIColor colorWithWhite:0.2 alpha:0.2]];
+    [self private_addShapeLayerWithFrame:CGRectMake(0, height /  2 + rectHeight / 2, width, height / 2 - rectHeight /  2)
+                     strokeColor:[UIColor clearColor]
+                       fillColor:[UIColor colorWithWhite:0.2 alpha:0.2]];
+    [self private_addShapeLayerWithFrame:CGRectMake((width - rectWidth) / 2 + rectWidth, height / 2 - rectHeight / 2 , width - rectWidth - (width - rectWidth) /  2, rectHeight)
+                     strokeColor:[UIColor clearColor]
+                       fillColor:[UIColor colorWithWhite:0.2 alpha:0.2]];
+    [self private_addShapeLayerWithFrame:CGRectMake((width - rectWidth) / 2, height / 2 - rectHeight / 2, rectWidth, rectHeight)
+                     strokeColor:[UIColor lightGrayColor]
+                       fillColor:[UIColor clearColor]];
+}
+- (void)private_addShapeLayerWithFrame:(CGRect)frame
+                   strokeColor:(UIColor *)strokeColor
+                     fillColor:(UIColor *)fillColor{
+    UIBezierPath *rectRangePath = [UIBezierPath bezierPathWithRect:frame];
+    rectRangePath.lineWidth = 1;
+    
+    CAShapeLayer *shapeLayer = [CAShapeLayer layer];
+    shapeLayer.frame = self.view.bounds;
+    [self.view.layer insertSublayer:shapeLayer above:_tailorImageView.layer];
+    shapeLayer.strokeColor = strokeColor.CGColor;
+    shapeLayer.fillColor = fillColor.CGColor;
+    shapeLayer.path = rectRangePath.CGPath;
+}
+
+- (void)private_showImage{ 
+    [[WFPhotoAlbum standarWFPhotosAlbum] getPhotosWithAsset:_asset
+                                              originalImage:YES
+                                                 completion:^(UIImage *image) {
+        CGFloat height = _tailorImageView.frame.size.width * image.size.height / image.size.width;
+        _tailorImageView.frame = CGRectMake(0, 0, _tailorImageView.frame.size.width, height);
+        _tailorImageView.center = self.view.center;
+        _tailorImageView.image = image;
+    }];
+}
+
+- (UIImage *)private_captureImageFromView:(UIView *)view{
+    CGRect screenRect = CGRectMake((self.view.frame.size.width - rectWidth) / 2,
+                                   (self.view.frame.size.height - rectHeight) / 2,
+                                   rectWidth,
+                                   rectHeight);
+    UIGraphicsBeginImageContextWithOptions(screenRect.size, NO, [UIScreen mainScreen].scale);
+    
+    CGContextRef context = UIGraphicsGetCurrentContext();
+    if (context == NULL){
+        return nil;
+    }
+    //copy 一份图形上下位文,用来操作
+    CGContextSaveGState(context);
+    //将当前图行位文进行矩阵变换
+    CGContextTranslateCTM(context, -screenRect.origin.x, -screenRect.origin.y);
+    
+    if( [view respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)]){
+        //捕捉当前快照
+        [view drawViewHierarchyInRect:view.bounds afterScreenUpdates:NO];
+    }else{
+        //layer 层渲染
+        [view.layer renderInContext:context];
+    }
+    //图形位文退出栈
+    CGContextRestoreGState(context);
+    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
+    UIGraphicsEndImageContext();
+    return image;
+}
+- (void)didReceiveMemoryWarning {
+    [super didReceiveMemoryWarning];
+    // Dispose of any resources that can be recreated.
+}
+
+@end