iOS 进度条、加载、安装动画简单实现。

首先看一下效果图：

下面贴上代码：

控制器ViewController：

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@end

/*** ---------------分割线--------------- ***/

#import "ViewController.h"
#import "HWWaveView.h"
#import "HWCircleView.h"
#import "HWProgressView.h"
#import "HWInstallView.h"

@interface ViewController ()

@property (nonatomic, strong) NSTimer *timer;
@property (nonatomic, weak) HWWaveView *waveView;
@property (nonatomic, weak) HWCircleView *circleView;
@property (nonatomic, weak) HWProgressView *progressView;
@property (nonatomic, weak) HWInstallView *installView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    //创建控件
    [self creatControl];
    
    //添加定时器
    [self addTimer];
}

- (void)creatControl
{
    //波浪
    HWWaveView *waveView = [[HWWaveView alloc] initWithFrame:CGRectMake(30, 100, 150, 150)];
    [self.view addSubview:waveView];
    self.waveView = waveView;
    
    //圆圈
    HWCircleView *circleView = [[HWCircleView alloc] initWithFrame:CGRectMake(220, 100, 150, 150)];
    [self.view addSubview:circleView];
    self.circleView = circleView;
    
    //进度条
    HWProgressView *progressView = [[HWProgressView alloc] initWithFrame:CGRectMake(30, 365, 150, 20)];
    [self.view addSubview:progressView];
    self.progressView = progressView;
    
    //加载安装效果
    HWInstallView *installView = [[HWInstallView alloc] initWithFrame:CGRectMake(220, 300, 150, 150)];
    [self.view addSubview:installView];
    self.installView = installView;
}

- (void)addTimer
{
    _timer = [NSTimer scheduledTimerWithTimeInterval:0.2f target:self selector:@selector(timerAction) userInfo:nil repeats:YES];
    [[NSRunLoop mainRunLoop] addTimer:_timer forMode:NSRunLoopCommonModes];
}

- (void)timerAction
{
    _waveView.progress += 0.01;
    _circleView.progress += 0.01;
    _progressView.progress += 0.01;
    _installView.progress += 0.01;
    
    if (_waveView.progress >= 1) {
        [self removeTimer];
        NSLog(@"完成");
    }
}

- (void)removeTimer
{
    [_timer invalidate];
    _timer = nil;
}

@end

波浪HWWaveView：

#import <UIKit/UIKit.h>

@interface HWWaveView : UIView

@property (nonatomic, assign) CGFloat progress;

@end

/*** ---------------分割线--------------- ***/

#import "HWWaveView.h"

#define KHWWaveFillColor [UIColor groupTableViewBackgroundColor] //填充颜色
#define KHWWaveTopColor [UIColor colorWithRed:0/255.0 green:191/255.0 blue:255/255.0 alpha:1.0f] //前面波浪颜色
#define KHWWaveBottomColor [UIColor colorWithRed:0/255.0 green:191/255.0 blue:255/255.0 alpha:0.4f] //后面波浪颜色

@interface HWWaveView ()

@property (nonatomic, strong) CADisplayLink *displayLink;
@property (nonatomic, assign) CGFloat wave_amplitude;//振幅a（y = asin(wx+φ) + k）
@property (nonatomic, assign) CGFloat wave_cycle;//周期w
@property (nonatomic, assign) CGFloat wave_h_distance;//两个波水平之间偏移
@property (nonatomic, assign) CGFloat wave_v_distance;//两个波竖直之间偏移
@property (nonatomic, assign) CGFloat wave_scale;//水波速率
@property (nonatomic, assign) CGFloat wave_offsety;//波峰所在位置的y坐标
@property (nonatomic, assign) CGFloat wave_move_width;//移动的距离，配合速率设置
@property (nonatomic, assign) CGFloat wave_offsetx;//偏移
@property (nonatomic, assign) CGFloat offsety_scale;//上升的速度

@end

@implementation HWWaveView

- (instancetype)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {
        self.backgroundColor = [UIColor clearColor];
        
        //初始化信息
        [self initInfo];
    }
    
    return self;
}

- (void)initInfo
{
    //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
    _offsety_scale = 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_offsety = (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_offsetx += _wave_move_width * _wave_scale;
    
    //完成
    if (_wave_offsety <= 0.01)  [self removeDisplayLinkAction];
    
    [self setNeedsDisplay];
}

- (void)removeDisplayLinkAction
{
    [_displayLink invalidate];
    _displayLink = nil;
}

- (void)drawRect:(CGRect)rect
{
    UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:rect];
    [KHWWaveFillColor setFill];
    [path fill];
    [path addClip];
    
    //绘制两个波形图
    [self drawWaveColor:KHWWaveTopColor offsetx:0 offsety:0];
    [self drawWaveColor:KHWWaveBottomColor 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_offsety != end_offY) {
        if (end_offY < _wave_offsety) {
            _wave_offsety = MAX(_wave_offsety -= (_wave_offsety - end_offY) * _offsety_scale, end_offY);
        }else {
            _wave_offsety = MIN(_wave_offsety += (end_offY - _wave_offsety) * _offsety_scale, 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_offsetx + offsetx / self.bounds.size.width * 2 * M_PI) + _wave_offsety + 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

圆圈HWCircleView：

#import <UIKit/UIKit.h>

@interface HWCircleView : UIView

@property (nonatomic, assign) CGFloat progress;

@end

/*** ---------------分割线--------------- ***/

#import "HWCircleView.h"

#define KHWCircleLineWidth 10.0f
#define KHWCircleFont [UIFont boldSystemFontOfSize:26.0f]
#define KHWCircleColor [UIColor colorWithRed:0/255.0 green:191/255.0 blue:255/255.0 alpha:1]

@interface HWCircleView ()

@property (nonatomic, weak) UILabel *cLabel;

@end

@implementation HWCircleView

- (instancetype)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {
        self.backgroundColor = [UIColor clearColor];
        
        //百分比标签
        UILabel *cLabel = [[UILabel alloc] initWithFrame:self.bounds];
        cLabel.font = KHWCircleFont;
        cLabel.textColor = KHWCircleColor;
        cLabel.textAlignment = NSTextAlignmentCenter;
        [self addSubview:cLabel];
        self.cLabel = cLabel;
    }

    return self;
}

- (void)setProgress:(CGFloat)progress
{
    _progress = progress;

    _cLabel.text = [NSString stringWithFormat:@"%d%%", (int)floor(progress * 100)];
    
    [self setNeedsDisplay];
}

- (void)drawRect:(CGRect)rect
{
    //路径
    UIBezierPath *path = [[UIBezierPath alloc] init];
    //线宽
    path.lineWidth = KHWCircleLineWidth;
    //颜色
    [KHWCircleColor set];
    //拐角
    path.lineCapStyle = kCGLineCapRound;
    path.lineJoinStyle = kCGLineJoinRound;
    //半径
    CGFloat radius = (MIN(rect.size.width, rect.size.height) - KHWCircleLineWidth) * 0.5;
    //画弧（参数：中心、半径、起始角度(3点钟方向为0)、结束角度、是否顺时针）
    [path addArcWithCenter:(CGPoint){rect.size.width * 0.5, rect.size.height * 0.5} radius:radius startAngle:M_PI * 1.5 endAngle:M_PI * 1.5 + M_PI * 2 * _progress clockwise:YES];
    //连线
    [path stroke];
}

@end

进度条HWProgressView：

#import <UIKit/UIKit.h>

@interface HWProgressView : UIView

@property (nonatomic, assign) CGFloat progress;

@end

/*** ---------------分割线--------------- ***/

#import "HWProgressView.h"

#define KProgressBorderWidth 2.0f
#define KProgressPadding 1.0f
#define KProgressColor [UIColor colorWithRed:0/255.0 green:191/255.0 blue:255/255.0 alpha:1]

@interface HWProgressView ()

@property (nonatomic, weak) UIView *tView;

@end

@implementation HWProgressView

- (instancetype)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {
        //边框
        UIView *borderView = [[UIView alloc] initWithFrame:self.bounds];
        borderView.layer.cornerRadius = self.bounds.size.height * 0.5;
        borderView.layer.masksToBounds = YES;
        borderView.backgroundColor = [UIColor whiteColor];
        borderView.layer.borderColor = [KProgressColor CGColor];
        borderView.layer.borderWidth = KProgressBorderWidth;
        [self addSubview:borderView];
        
        //进度
        UIView *tView = [[UIView alloc] init];
        tView.backgroundColor = KProgressColor;
        tView.layer.cornerRadius = (self.bounds.size.height - (KProgressBorderWidth + KProgressPadding) * 2) * 0.5;
        tView.layer.masksToBounds = YES;
        [self addSubview:tView];
        self.tView = tView;
    }
    
    return self;
}

- (void)setProgress:(CGFloat)progress
{
    _progress = progress;
    
    CGFloat margin = KProgressBorderWidth + KProgressPadding;
    CGFloat maxWidth = self.bounds.size.width - margin * 2;
    CGFloat heigth = self.bounds.size.height - margin * 2;
    
    _tView.frame = CGRectMake(margin, margin, maxWidth * progress, heigth);
}

@end

加载安装效果HWInstallView：

#import <UIKit/UIKit.h>

@interface HWInstallView : UIView

@property (nonatomic, assign) CGFloat progress;

@end

/*** ---------------分割线--------------- ***/

#import "HWInstallView.h"

#define KHWInstallViewMargin 10
#define KHWInstallColor [UIColor colorWithRed:0/255.0 green:191/255.0 blue:255/255.0 alpha:1]

@implementation HWInstallView

- (instancetype)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {
        self.backgroundColor = [UIColor clearColor];
    }
    
    return self;
}

- (void)setProgress:(CGFloat)progress
{
    _progress = progress;
    
    [self setNeedsDisplay];
}

- (void)drawRect:(CGRect)rect
{
    CGContextRef context = UIGraphicsGetCurrentContext();
    
    CGFloat xCenter = rect.size.width * 0.5;
    CGFloat yCenter = rect.size.height * 0.5;
    CGFloat radius = MIN(rect.size.width, rect.size.height) * 0.5 - KHWInstallViewMargin;
    
    //背景遮罩
    [KHWInstallColor set];
    CGFloat lineW = MAX(rect.size.width, rect.size.height) * 0.5;
    CGContextSetLineWidth(context, lineW);
    CGContextAddArc(context, xCenter, yCenter, radius + lineW * 0.5 + 5, 0, M_PI * 2, 1);
    CGContextStrokePath(context);
    
    //进程圆
    CGContextSetLineWidth(context, 1);
    CGContextMoveToPoint(context, xCenter, yCenter);
    CGContextAddLineToPoint(context, xCenter, 0);
    CGFloat endAngle = - M_PI * 0.5 + _progress * M_PI * 2 + 0.001;
    CGContextAddArc(context, xCenter, yCenter, radius, - M_PI * 0.5, endAngle, 1);
    CGContextFillPath(context);
}

@end

iOS 进度条、加载、安装动画 —— HERO博客