//
//  RootViewController.m
//
//  Copyright (c) 2014年 Y.X. All rights reserved.
//

#import "RootViewController.h"
#import "UIImage+ImageEffects.h"@interface RootViewController ()@property (nonatomic, strong) UIView        *showView;
@property (nonatomic, strong) CAShapeLayer  *oneReferenceLayer;
@property (nonatomic, strong) CAShapeLayer  *maskLayer;@end#define   DEGREES(degrees)  ((M_PI * (degrees))/ 180.f)@implementation RootViewController- (void)handlePan:(UIPanGestureRecognizer *)recognizer
{// 拖拽CGPoint translation = [recognizer translationInView:self.view];recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x,recognizer.view.center.y + translation.y);[recognizer setTranslation:CGPointMake(0, 0) inView:self.view];// 关闭CoreAnimation实时动画绘制(核心)
    [CATransaction setDisableActions:YES];_maskLayer.position = recognizer.view.center;
}- (void)viewDidLoad
{[super viewDidLoad];/* ====== 背景View ====== */UIImageView *imageView = [[UIImageView alloc] initWithFrame:self.view.bounds];imageView.image = [UIImage imageNamed:@"back"];[self.view addSubview:imageView];/* ====== 作为mask的View ====== */_maskLayer = [CAShapeLayer layer];// 贝塞尔曲线(创建一个圆)UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(0, 0)radius:100startAngle:DEGREES(0)endAngle:DEGREES(360)clockwise:YES];// 获取path_maskLayer.path     = path.CGPath;_maskLayer.position = CGPointMake(_showView.bounds.size.width/2.f,_showView.bounds.size.height/2.f);// 设置填充颜色为透明_maskLayer.fillColor = [UIColor blackColor].CGColor;_maskLayer.position = self.view.center;UIView *blurView = [[UIView alloc] initWithFrame:self.view.bounds];blurView.backgroundColor = [UIColor blackColor];[self.view addSubview:blurView];blurView.layer.mask = _maskLayer;blurView.layer.contents = (__bridge id)([[UIImage imageNamed:@"back"] blurImage].CGImage);/* ====== 透明的View,用于maskView中的ShapeLayer的参考View(用于拖拽) ====== */_showView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];_showView.backgroundColor = [UIColor clearColor];_showView.center = self.view.center;[self.view addSubview:_showView];UIPanGestureRecognizer *recognizer = \[[UIPanGestureRecognizer alloc] initWithTarget:selfaction:@selector(handlePan:)];[_showView addGestureRecognizer:recognizer];
}@end