1.封装iOS活动指示器。

common/ActivityIndicator/RAActivityIndicator+Show.h

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+//
+//  RAActivityIndicator+Show.h
+//  Test
+//
+//  Created by Jack on 2019/2/1.
+//  Copyright © 2019 Jack Template. All rights reserved.
+//
+
+#import "RAActivityIndicator.h"
+
+@interface RAActivityIndicator (Show)
+
++ (instancetype)activityIndicatorShowOnView:(UIView *)view withType:(RAActivityType)type;
+
+- (void)dismiss;
+
+- (void)dismiss:(void(^)(void))completion;
+
+@end
+
+

common/ActivityIndicator/RAActivityIndicator+Show.m

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+//
+//  RAActivityIndicator+Show.m
+//  Test
+//
+//  Created by Jack on 2019/2/1.
+//  Copyright © 2019 Jack Template. All rights reserved.
+//
+
+#import "RAActivityIndicator+Show.h"
+
+@implementation RAActivityIndicator (Show)
+
++ (instancetype)activityIndicatorShowOnView:(UIView *)view withType:(RAActivityType)type {
+    
+    RAActivityIndicator *indicator = [RAActivityIndicator activityIndicatorWithType:type];
+    
+    [view addSubview:indicator];
+    
+    indicator.translatesAutoresizingMaskIntoConstraints = NO;
+    
+    CGFloat indicator_width = CGRectGetWidth(indicator.frame);
+    CGFloat indicator_height = CGRectGetHeight(indicator.frame);
+    
+    [indicator.centerXAnchor constraintEqualToAnchor:view.centerXAnchor].active = YES;
+    [indicator.centerYAnchor constraintEqualToAnchor:view.centerYAnchor].active = YES;
+    [indicator.widthAnchor constraintEqualToConstant:indicator_width].active = YES;
+    [indicator.heightAnchor constraintEqualToConstant:indicator_height].active = YES;
+    
+    return indicator;
+}
+
+- (void)dismiss {
+    [self dismiss:nil];
+}
+
+- (void)dismiss:(void(^)(void))completion {
+    
+    [UIView animateWithDuration:0.5 animations:^{
+        
+        self.alpha = 0.4f;
+    } completion:^(BOOL finished) {
+        
+        if (completion) {
+            completion();
+        }
+        [self removeFromSuperview];
+    }];
+}
+
+@end

common/ActivityIndicator/RAActivityIndicator.h

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+//
+//  RAActivityIndicator.h
+//  Test
+//
+//  Created by Jack on 2019/2/1.
+//  Copyright © 2019 Jack Template. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+typedef NS_ENUM(NSInteger, RAActivityType) {
+    
+    RAActivityTypeDot,
+    RAActivityTypeSlash
+};
+
+@interface RAActivityIndicator : UIView
+
++ (instancetype)activityIndicatorWithType:(RAActivityType)type;/// 大小不可变，改变位置可调用setCenter:方法
+
+@end

common/ActivityIndicator/RAActivityIndicator.m

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+//
+//  RAActivityIndicator.m
+//  Test
+//
+//  Created by Jack on 2019/2/1.
+//  Copyright © 2019 Jack Template. All rights reserved.
+//
+
+#import "RAActivityIndicator.h"
+
+static const NSInteger kReplicationCount = 3;
+static const CGFloat kSize = 20.f;
+static const CGFloat kInterval = 5.f;
+static const CGFloat kWidth = kSize * kReplicationCount + kInterval * (kReplicationCount - 1);
+static const CGFloat kHeight = kSize;
+static const NSTimeInterval kAnimateDuration = 1.f;
+static NSString * const kAnimationKey = @"ra.activity.indictor.animation";
+
+
+@interface RAActivityIndicator ()
+
+@property (nonatomic,strong) CAReplicatorLayer *replicatorLayer;
+@property (nonatomic,strong) CAShapeLayer *activityLayer;
+
+@end
+
+@implementation RAActivityIndicator
+
++ (instancetype)activityIndicatorWithType:(RAActivityType)type {
+    
+    RAActivityIndicator *loadingView = [[RAActivityIndicator alloc] initPrivateFrame:CGRectMake(0, 0, kWidth, kHeight)];
+    
+    [loadingView setup:type];
+    return loadingView;
+}
+
+#pragma mark - Override
+
+- (instancetype)initWithFrame:(CGRect)frame {
+    if (self = [super initWithFrame:CGRectZero]) {
+        
+    }
+    return self;
+}
+
+- (void)setFrame:(CGRect)frame {
+    
+}
+
+- (void)setBounds:(CGRect)bounds {
+    
+}
+
+- (void)setTintColor:(UIColor *)tintColor {
+    [super setTintColor:tintColor];
+    self.activityLayer.fillColor = tintColor.CGColor;
+}
+
+- (void)setHidden:(BOOL)hidden {
+    [super setHidden:hidden];
+    
+    if (hidden) {
+        [self stopAnimating];
+    } else{
+        [self startAnimating];
+    }
+}
+
+#pragma mark - Setup
+
+- (void)ra_setFrame:(CGRect)frame {
+    super.frame = frame;
+}
+
+- (instancetype)initPrivateFrame:(CGRect)frame {
+    if (self = [super initWithFrame:frame]) {
+        [self ra_setFrame:frame];
+    }
+    return self;
+}
+
+- (void)setup:(RAActivityType)type {
+    
+    self.replicatorLayer.frame = self.bounds;
+    [self.layer addSublayer:self.replicatorLayer];
+    
+    switch (type) {
+        case RAActivityTypeDot: {
+            self.activityLayer.path = [self dotPath].CGPath;
+        }
+            break;
+        case RAActivityTypeSlash: {
+            self.activityLayer.path = [self slashPath].CGPath;
+        }
+            break;
+    }
+    [self.replicatorLayer addSublayer:self.activityLayer];
+    
+    [self startAnimating];
+}
+
+#pragma mark - Path
+
+// 斜杠
+- (UIBezierPath *)slashPath {
+    UIBezierPath *path = [UIBezierPath bezierPath];
+    [path moveToPoint:CGPointMake(0, 0)];
+    [path addLineToPoint:CGPointMake(kSize * 0.5, 0)];
+    [path addLineToPoint:CGPointMake(kSize, kSize)];
+    [path addLineToPoint:CGPointMake(kSize * 0.5, kSize)];
+    [path closePath];
+    return path;
+}
+
+// 圆点
+- (UIBezierPath *)dotPath {
+    UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, kSize, kSize)];
+    return path;
+}
+
+#pragma mark - Getter
+
+- (CAReplicatorLayer *)replicatorLayer {
+    if (!_replicatorLayer) {
+        _replicatorLayer = [CAReplicatorLayer layer];
+        _replicatorLayer.backgroundColor = [UIColor clearColor].CGColor;
+    }
+    return _replicatorLayer;
+}
+
+- (CAShapeLayer *)activityLayer {
+    if (!_activityLayer) {
+        _activityLayer = [CAShapeLayer layer];
+        _activityLayer.fillColor = [UIColor darkGrayColor].CGColor;
+    }
+    return _activityLayer;
+}
+
+#pragma mark - Animation
+
+- (CABasicAnimation *)alphaAnimation{
+    //设置透明度动画
+    CABasicAnimation *alpha = [CABasicAnimation animationWithKeyPath:@"opacity"];
+    alpha.fromValue = @1.0;
+    alpha.toValue = @0.01;
+    alpha.duration = 1.f;
+    return alpha;
+}
+
+- (CABasicAnimation *)scaleAnimation{
+    //设置缩放动画
+    CABasicAnimation *scale = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
+    scale.toValue = @0.8;
+    scale.fromValue = @1;
+    return scale;
+}
+
+- (CABasicAnimation *)positionAnimation {
+    
+    CABasicAnimation *center = [CABasicAnimation animationWithKeyPath:@"position"];
+    center.fromValue = [NSValue valueWithCGPoint:CGPointMake(kSize * 0.5f, 0)];
+    center.toValue = [NSValue valueWithCGPoint:CGPointMake(kWidth - kSize * 0.5f, 0)];
+    return center;
+}
+
+- (void)startAnimating {
+    if (![self.activityLayer.animationKeys containsObject:kAnimationKey] && !self.hidden) {
+        
+        //复制的图层数为三个
+        self.replicatorLayer.instanceCount = kReplicationCount;
+        //设置每个复制图层延迟时间
+        self.replicatorLayer.instanceDelay = kAnimateDuration / kReplicationCount;
+        //设置每个图层之间的偏移
+        self.replicatorLayer.instanceTransform = CATransform3DMakeTranslation(kSize + kInterval, 0, 0);
+        
+        CAAnimationGroup *group = [CAAnimationGroup animation];
+        group.animations = @[[self alphaAnimation],  [self scaleAnimation]];
+        group.duration = kAnimateDuration;
+        group.repeatCount = HUGE;
+        [self.activityLayer addAnimation:group forKey:kAnimationKey];
+    }
+}
+
+- (void)stopAnimating {
+    if ([self.activityLayer.animationKeys containsObject:kAnimationKey]) {
+        
+        //复制的图层数为三个
+        self.replicatorLayer.instanceCount = 0;
+        
+        [self.activityLayer removeAnimationForKey:kAnimationKey];
+    }
+}
+
+@end