#import <UIKit/UIKit.h>
@class AvatorImageViewController;
@protocol AvatorImageViewControllerDelegate <NSObject>
- (void)avatorImageViewControllerDidCancel:(AvatorImageViewController *)controller;
- (void)avatorImageViewController:(AvatorImageViewController *)controller didFinishPickingImage:(UIImage *)image;
@end
@interface AvatorImageViewController : UIViewController
@property (nonatomic, strong) UIImage *image;
@property (nonatomic, weak) id<AvatorImageViewControllerDelegate> delegate;
@end
#import "AvatorImageViewController.h"
static CGFloat viewW;
static CGFloat viewH;
static CGFloat newImageW;
static CGFloat newImageH;
static const CGFloat animationTime = 0.3f;
static CGFloat maxScale;
@interface AvatorImageViewController ()
/*! 圖片 */
@property (nonatomic, strong) UIImageView *imageView;
/*! 邊框 */
@property (nonatomic, strong) UIView *borderView;
/*! 圖片舊frame */
@property (nonatomic, assign) CGRect imageViewOldRect;
@end
@implementation AvatorImageViewController
- (void)viewDidLoad {
[super viewDidLoad];
viewW = self.view.frame.size.width;
viewH = self.view.frame.size.height;
/*! 初始化圖片 */
[self setupImage];
/*! 初始化手勢 */
[self setupGesture];
/*! 初始化遮罩層 */
[self setupMaskView];
/*! 初始化按鈕 */
[self setupButtons];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - 初始化
- (void)setupImage{
self.imageView = [[UIImageView alloc] initWithImage:self.image];
self.imageView.center = self.view.center;
[self.view addSubview:self.imageView];
newImageW = kScreenW;
newImageH = self.image.size.height / (self.image.size.width / kScreenW);
self.imageView.bounds = CGRectMake(0, 0, newImageW, newImageH);
self.imageViewOldRect = self.imageView.frame;
}
- (void)setupGesture{
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAvatorImage:)];
[self.view addGestureRecognizer:pan];
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchAvatorImage:)];
[self.view addGestureRecognizer:pinch];
}
- (void)setupMaskView{
UIView *maskView = [[UIView alloc] init];
maskView.backgroundColor = [UIColor blackColor];
maskView.alpha = 0.6;
maskView.frame = self.view.bounds;
[self.view addSubview:maskView];
//遮罩
CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
CGMutablePathRef path = CGPathCreateMutable();
CGPathAddRect(path, nil, CGRectMake(0, 0, viewW, (viewH-viewW)*0.5));
CGPathAddRect(path, nil, CGRectMake(0, (viewH-viewW)*0.5+viewW, viewW, (viewH-viewW)*0.5));
maskLayer.path = path;
maskView.layer.mask = maskLayer;
//框
self.borderView = [[UIView alloc] init];
self.borderView.backgroundColor = [UIColor clearColor];
self.borderView.layer.borderWidth = 1;
self.borderView.layer.borderColor = [UIColor whiteColor].CGColor;
self.borderView.frame = CGRectMake(0, (viewH-viewW)*0.5, viewW, viewW);
[self.view addSubview:self.borderView];
}
- (void)setupButtons{
UIButton *cancelBtn = [UIButton buttonWithType:UIButtonTypeCustom];
cancelBtn.frame = CGRectMake(20, kScreenH - 50, 60, 25);
[cancelBtn setTitle:@"取消" forState:UIControlStateNormal];
[cancelBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[cancelBtn addTarget:self action:@selector(cancelBtnDidClick:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:cancelBtn];
UIButton *selectBtn = [UIButton buttonWithType:UIButtonTypeCustom];
selectBtn.frame = CGRectMake(kScreenW-60-20, kScreenH-50, 60, 25);
[selectBtn setTitle:@"選取" forState:UIControlStateNormal];
[selectBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[selectBtn addTarget:self action:@selector(selectBtnDidClick:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:selectBtn];
}
#pragma mark - 按鈕
- (void)cancelBtnDidClick:(UIButton *)btn{
self.imageView.frame = self.imageViewOldRect;
if ([self.delegate respondsToSelector:@selector(avatorImageViewControllerDidCancel:)]) {
[self.delegate avatorImageViewControllerDidCancel:self];
}
[self dismissViewControllerAnimated:YES completion:nil];
}
- (void)selectBtnDidClick:(UIButton *)btn{
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
UIGraphicsBeginImageContextWithOptions(CGSizeMake(viewW, viewW), YES, [UIScreen mainScreen].scale);
// 這時(shí)候的imagerect要相對這個(gè)上下文了
// y:減掉(viewH-viewW)/2是因?yàn)镃GSizeMake(viewW, viewW) 高度為viewW
CGRect imageRect = CGRectMake(self.imageView.frame.origin.x, self.imageView.frame.origin.y - (viewH-viewW)/2, self.imageView.frame.size.width, self.imageView.frame.size.height);
[self.imageView.image drawInRect:imageRect];
UIImage * tempImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
dispatch_async(dispatch_get_main_queue(), ^{
// 不做這處理放大很多的情況下會(huì)有bug
self.imageView.frame = self.imageViewOldRect;
if ([self.delegate respondsToSelector:@selector(avatorImageViewController:didFinishPickingImage:)]) {
[self.delegate avatorImageViewController:self didFinishPickingImage:tempImage];
}
[self dismissViewControllerAnimated:YES completion:nil];
});
});
}
#pragma mark - 手勢
- (void)panAvatorImage:(UIPanGestureRecognizer *)gesture{
if (gesture.state == UIGestureRecognizerStateBegan || gesture.state == UIGestureRecognizerStateChanged) {
CGPoint transLationPoint = [gesture translationInView:self.view];
CGFloat newCentX = self.imageView.center.x + transLationPoint.x;
CGFloat newCentY = self.imageView.center.y + transLationPoint.y;
self.imageView.center = CGPointMake(newCentX, newCentY);
[gesture setTranslation:CGPointZero inView:self.view.superview];
}else if (gesture.state == UIGestureRecognizerStateEnded) {
[self translateAnimation];
}
}
- (void)pinchAvatorImage:(UIPinchGestureRecognizer *)gesture{
if (gesture.state == UIGestureRecognizerStateBegan || gesture.state == UIGestureRecognizerStateChanged) {
CGFloat newWidth = self.imageView.frame.size.width * gesture.scale;
CGFloat newHeight = self.imageView.frame.size.height * gesture.scale;
self.imageView.bounds = CGRectMake(0, 0, newWidth, newHeight);
gesture.scale = 1;
}else if (gesture.state == UIGestureRecognizerStateEnded) {
// 處理縮放(超過縮放范圍則觸發(fā)彈簧效果)
[self scaleAnimation];
// 處理移動(dòng)(超過邊緣則觸發(fā)彈簧效果)
[self translateAnimation];
}
}
- (void)scaleAnimation{
CGFloat scale = self.imageView.frame.size.width/viewW;
maxScale = 1.5 + self.image.size.width/kScreenW<1?1:self.image.size.width/kScreenW/2;
// 縮放比例大于最大比例或者小于最小比例則回到對應(yīng)比例
if (scale < 1) {
[UIView animateWithDuration:animationTime animations:^{
self.imageView.bounds = CGRectMake(0, 0, newImageW, newImageH);
}];
}else if (scale > maxScale) {
[UIView animateWithDuration:animationTime animations:^{
self.imageView.bounds = CGRectMake(0, 0, newImageW * maxScale, newImageH * maxScale);
}];
}
}
- (void)translateAnimation{
CGRect borderRect = self.borderView.frame;
CGRect imageRect = self.imageView.frame;
//水平方向
if (imageRect.origin.x > borderRect.origin.x) {
imageRect.origin.x = borderRect.origin.x;
}
if (CGRectGetMaxX(imageRect) < CGRectGetMaxX(borderRect)) {
imageRect.origin.x = CGRectGetMaxX(borderRect) - imageRect.size.width;
}
//垂直方向
if (imageRect.origin.y > borderRect.origin.y) {
imageRect.origin.y = borderRect.origin.y;
}
if (CGRectGetMaxY(imageRect) < CGRectGetMaxY(borderRect)) {
imageRect.origin.y = CGRectGetMaxY(borderRect) - imageRect.size.height;
}
//寬度高度
if (imageRect.size.width < borderRect.size.width || imageRect.size.height < borderRect.size.height){
[UIView animateWithDuration:animationTime animations:^{
self.imageView.center = self.borderView.center;
}];
}
else{
[UIView animateWithDuration:animationTime animations:^{
self.imageView.frame = imageRect;
}];
}
}
@end
