首先來看看效果圖
實現過程如下
控制器調用就一句代碼:
[self showLoadingInView:self.view];
方便控制器如此調用,就要為控制器添加一個分類
.h檔案
#import <UIKit/UIKit.h>#import "GQCircleLoadView.h"@interface UIViewController (GQCircleLoad)//顯示動畫- (void)showLoadingInView:(UIView*)view;//隱藏動畫- (void)hideLoad;@property (nonatomic,strong) GQCircleLoadView *loadingView;@end
.m檔案
#import "UIViewController+GQCircleLoad.h"#import <objc/runtime.h>@implementation UIViewController (GQCircleLoad)- (GQCircleLoadView*)loadingView{ return objc_getAssociatedObject(self, @"loadingView");}- (void)setLoadingView:(GQCircleLoadView*)loadingView{ objc_setAssociatedObject(self, @"loadingView", loadingView, OBJC_ASSOCIATION_RETAIN_NONATOMIC);}- (void)showLoadingInView:(UIView*)view{ if (self.loadingView == nil) { self.loadingView = [[GQCircleLoadView alloc]init]; } if (view) { [view addSubview:self.loadingView]; self.loadingView.frame = view.bounds; }else{ UIWindow *appKeyWindow = [UIApplication sharedApplication].keyWindow; [appKeyWindow addSubview:self.loadingView]; self.loadingView.frame = appKeyWindow.bounds; }}- (void)hideLoad{ [self.loadingView removeFromSuperview];}@end
接下來就是GQCircleLoadView
繼承UIView
,裡面通過drawRect
畫出圓圈,並且動畫的實現
#import "GQCircleLoadView.h"#define WINDOW_width [[UIScreen mainScreen] bounds].size.width#define WINDOW_height [[UIScreen mainScreen] bounds].size.heightstatic NSInteger circleCount = 3;static CGFloat cornerRadius = 10;static CGFloat magin = 15;@interface GQCircleLoadView()<CAAnimationDelegate>@property (nonatomic, strong) NSMutableArray *layerArr;@end@implementation GQCircleLoadView- (instancetype)initWithFrame:(CGRect)frame{ if (self = [super initWithFrame:frame]) { self.backgroundColor = [UIColor clearColor]; } return self;}// 畫圓- (void)drawCircles{ for (NSInteger i = 0; i < circleCount; ++i) { CGFloat x = (WINDOW_width - (cornerRadius*2) * circleCount - magin * (circleCount-1)) / 2.0 + i * (cornerRadius*2 + magin) + cornerRadius; CGRect rect = CGRectMake(-cornerRadius, -cornerRadius , 2*cornerRadius, 2*cornerRadius); UIBezierPath *beizPath=[UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:cornerRadius]; CAShapeLayer *layer=[CAShapeLayer layer]; layer.path=beizPath.CGPath; layer.fillColor=[UIColor grayColor].CGColor; layer.position = CGPointMake(x, self.frame.size.height * 0.5); [self.layer addSublayer:layer]; [self.layerArr addObject:layer]; } [self drawAnimation:self.layerArr[0]]; // 旋轉(可開啟試試效果)// CABasicAnimation* rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.y"];// rotationAnimation.toValue = [NSNumber numberWithFloat: - M_PI * 2.0 ];// rotationAnimation.duration = 1;// rotationAnimation.cumulative = YES;// rotationAnimation.repeatCount = MAXFLOAT;// [self.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];}// 動畫實現- (void)drawAnimation:(CALayer*)layer { CABasicAnimation *scaleUp = [CABasicAnimation animationWithKeyPath:@"transform.scale"]; scaleUp.fromValue = @1; scaleUp.toValue = @1.5; scaleUp.duration = 0.25; scaleUp.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut]; CABasicAnimation *scaleDown = [CABasicAnimation animationWithKeyPath:@"transform.scale"]; scaleDown.beginTime = scaleUp.duration; scaleDown.fromValue = @1.5; scaleDown.toValue = @1; scaleDown.duration = 0.25; scaleDown.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut]; CAAnimationGroup *group = [[CAAnimationGroup alloc] init]; group.animations = @[scaleUp, scaleDown]; group.repeatCount = 0; group.duration = scaleUp.duration + scaleDown.duration; group.delegate = self; [layer addAnimation:group forKey:@"groupAnimation"];}#pragma mark - CAAnimationDelegate- (void)animationDidStart:(CAAnimation *)anim{ if ([anim isKindOfClass:CAAnimationGroup.class]) { CAAnimationGroup *animation = (CAAnimationGroup *)anim; [self.layerArr enumerateObjectsUsingBlock:^(CAShapeLayer *obj, NSUInteger idx, BOOL * _Nonnull stop) { CAAnimationGroup *a0 = (CAAnimationGroup *)[obj animationForKey:@"groupAnimation"]; if (a0 && a0 == animation) { CAShapeLayer *nextlayer = self.layerArr[(idx+1)>=self.layerArr.count?0:(idx+1)]; [self performSelector:@selector(drawAnimation:) withObject:nextlayer afterDelay:0.25]; *stop = YES; } }]; }}- (void)drawRect:(CGRect)rect{ [super drawRect:rect]; [self drawCircles];}- (NSMutableArray *)layerArr{ if (_layerArr == nil) { _layerArr = [[NSMutableArray alloc] init]; } return _layerArr;}@end
Demo就不上傳了,總共四個檔案代碼已經全貼上了!
總結
以上就是這篇文章的全部內容了,有興趣可以試試開啟上面的旋轉的動畫代碼,關閉旋轉代碼,進一步修改也可實現出QQ郵箱的下拉重新整理效果,希望這篇文章的內容對大家的學習或者工作能帶來一定的協助,如果有疑問大家可以留言交流。