//

//  BallonView.m

//  气球上升的动画

//

//  Created by Mac on 16/1/8.

//  Copyright © 2016年 Mac. All rights reserved.

//

#import "BallonView.h"

@interface BallonView()

@property (nonatomic, assign) NSString *postions;

@property (nonatomic, strong) CADisplayLink *link;

@property (nonatomic, strong) NSMutableArray *locations;

@property (nonatomic, strong) NSMutableArray *ballons;

@end

@implementation BallonView

//懒加载 存储位置

- (NSMutableArray *)locations

{

    if (!_locations) {

        _locations = [NSMutableArray array];

    }

    return _locations;

}

- (NSMutableArray *)ballons

{

    if (!_ballons) {

        _ballons = [NSMutableArray array];

        NSInteger count = ;

        UIImage *ballonImage =[UIImage imageNamed:@"sandyBalloon"];

        for (int i = ; i < count; i ++) {

            CGFloat left = ;

            CGPoint location = CGPointMake(left*(i+), self.frame.size.height - );

//            [ballonImage drawAtPoint:location];

            [self.locations addObject:[NSValue valueWithCGPoint:location]];

            [_ballons addObject:ballonImage];

        }

    }

   return _ballons;

}

// Only override drawRect: if you perform custom drawing.

// An empty implementation adversely affects performance during animation.

- (void)drawRect:(CGRect)rect {

    NSInteger ballonsOfCount = self.ballons.count;

    for (int i = ; i < ballonsOfCount; i ++) {

//        获取气球的位置

        CGPoint postion = [self.locations[i] CGPointValue];

        postion.y -= arc4random_uniform() * 0.7;

        if (postion.y == ) {

            postion.y = rect.size.height;

        }

        [self.locations replaceObjectAtIndex:i withObject:[NSValue valueWithCGPoint:postion]];

        [self.ballons[i] drawAtPoint:postion];

    }

    NSLog(@"%s",__func__);

}

//    ------------------------------------------------------------------------------------------------------------------

    // Drawing code

- (instancetype)init

{

    if (self = [super init]) {

        [self addAnimition];

    }

    return self;

}

- (void) addAnimition

{

//    [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(setNeedsDisplay) userInfo:nil repeats:YES];

    CADisplayLink *link = [CADisplayLink displayLinkWithTarget:self selector:@selector(setNeedsDisplay)];

    [link addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];

    self.link = link;

}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event

{

    [self.link invalidate];

}

@end