#import <UIKit/UIKit.h>
@interface PKWaveView : UIView
@property (assign, nonatomic) CGFloat progress;
@end
#import "PKWaveView.h"
#define kWaveFillColor [UIColor groupTableViewBackgroundColor] //填充颜色
#define kWaveTopColor [UIColor colorWithRed:0/255.0 green:191/255.0 blue:255/255.0 alpha:1.0f] //前面波浪颜色
#define kWaveBottomColor [UIColor colorWithRed:0/255.0 green:191/255.0 blue:255/255.0 alpha:0.4f] //后面波浪颜色
@interface PKWaveView ()
@property (assign, nonatomic) CGFloat wave_amplitude; //振幅a(y = asin(wx+φ) + k)
@property (assign, nonatomic) CGFloat wave_cycle; //周期w
@property (assign, nonatomic) CGFloat wave_v_distance; //两个波水平之间的偏移
@property (assign, nonatomic) CGFloat wave_h_distance; //两个波垂直之间的偏移
@property (assign, nonatomic) CGFloat wave_scale; //水波速率
@property (assign, nonatomic) CGFloat wave_offset_y; //波峰所在位置的y坐标
@property (assign, nonatomic) CGFloat wave_move_width; //移动的距离，配合速率设置
@property (assign, nonatomic) CGFloat wave_offset_x; //偏移
@property (assign, nonatomic) CGFloat offset_y_speed; //上升速度
@property (nonatomic, strong) CADisplayLink *displayLink;
@end
@implementation PKWaveView
-(instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
self.backgroundColor = [UIColor clearColor];
[self initDefaultStyle];
}
return self;
}
- (void)initDefaultStyle
{
//进度
_progress = 0;
//振幅
_wave_amplitude = self.frame.size.height / 25;
//周期
_wave_cycle = 2 * M_PI / (self.frame.size.width * 0.9);
//两个波水平之间偏移
_wave_h_distance = 2 * M_PI / _wave_cycle * 0.6;
//两个波竖直之间偏移
_wave_v_distance = _wave_amplitude * 0.4;
//移动的距离，配合速率设置
_wave_move_width = 0.5;
//水波速率
_wave_scale = 0.4;
//上升的速度
_offset_y_speed = 0.1;
//波峰所在位置的y坐标，刚开始的时候_wave_offsety是最大值
_wave_offset_y = (1 - _progress) * (self.frame.size.height + 2 * _wave_amplitude);
[self addDisplayLinkAction];
}
- (void)addDisplayLinkAction
{
_displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(displayLinkAction)];
[_displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];
}
- (void)displayLinkAction
{
_wave_offset_x += _wave_move_width * _wave_scale;
//完成
if (_wave_offset_y <= 0.01) [self removeDisplayLinkAction];
[self setNeedsDisplay];
}
- (void)removeDisplayLinkAction
{
[_displayLink invalidate];
_displayLink = nil;
}
- (void)drawRect:(CGRect)rect
{
UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:rect];
[kWaveFillColor setFill];
[path fill];
[path addClip];
//绘制两个波形图
[self drawWaveColor:kWaveTopColor offsetx:0 offsety:0];
[self drawWaveColor:kWaveBottomColor offsetx:_wave_h_distance offsety:_wave_v_distance];
}
- (void)drawWaveColor:(UIColor *)color offsetx:(CGFloat)offsetx offsety:(CGFloat)offsety
{
//波浪动画，进度的实际操作范围是，多加上两个振幅的高度，到达设置进度的位置y
CGFloat end_offY = (1 - _progress) * (self.frame.size.height + 2 * _wave_amplitude);
if (_wave_offset_y != end_offY) {
if (end_offY < _wave_offset_y) {
_wave_offset_y = MAX(_wave_offset_y -= (_wave_offset_y - end_offY) * _offset_y_speed, end_offY);
}else {
_wave_offset_y = MIN(_wave_offset_y += (end_offY - _wave_offset_y) * _offset_y_speed, end_offY);
}
}
UIBezierPath *wavePath = [UIBezierPath bezierPath];
for (float next_x = 0.f; next_x <= self.frame.size.width; next_x ++) {
//正弦函数，绘制波形
CGFloat next_y = _wave_amplitude * sin(_wave_cycle * next_x + _wave_offset_x + offsetx / self.bounds.size.width * 2 * M_PI) + _wave_offset_y + offsety;
if (next_x == 0) {
[wavePath moveToPoint:CGPointMake(next_x, next_y - _wave_amplitude)];
}else {
[wavePath addLineToPoint:CGPointMake(next_x, next_y - _wave_amplitude)];
}
}
[wavePath addLineToPoint:CGPointMake(self.frame.size.width, self.frame.size.height)];
[wavePath addLineToPoint:CGPointMake(0, self.bounds.size.height)];
[color set];
[wavePath fill];
}
@end