FBShimmeringView *shimmeringView = [[FBShimmeringView alloc] initWithFrame:self.view.bounds];
[self.view addSubview:shimmeringView];UILabel *loadingLabel = [[UILabel alloc] initWithFrame:shimmeringView.bounds];
loadingLabel.textAlignment = NSTextAlignmentCenter;
loadingLabel.text = NSLocalizedString(@"Shimmer", nil);
shimmeringView.contentView = loadingLabel;// Start shimmering.
shimmeringView.shimmering = YES;

//
//  RootViewController.m
//
//  Copyright (c) 2014年 Y.X. All rights reserved.
//

#import "RootViewController.h"
#import "FBShimmeringLayer.h"
#import "CAShapeLayer+Circle.h"
#import "YXGCD.h"
#import "POP.h"@interface RootViewController ()@property (nonatomic, strong) GCDTimer  *timer;@end@implementation RootViewController- (void)viewDidLoad
{[super viewDidLoad];self.view.backgroundColor = [UIColor blackColor];// 直接使用layer层做动画FBShimmeringLayer *showLayer = [FBShimmeringLayer new];showLayer.frame = (CGRect){CGPointZero, CGSizeMake(200, 200)};showLayer.position = self.view.center;showLayer.shimmering = YES;showLayer.shimmeringBeginFadeDuration = 0.3;showLayer.shimmeringOpacity = 0.3;showLayer.shimmeringPauseDuration = 0.6f;[self.view.layer addSublayer:showLayer];// 制造形状的layerCAShapeLayer *layer = [CAShapeLayer layer];layer.lineWidth = 1.f;layer.strokeColor = [UIColor redColor].CGColor;showLayer.contentLayer = layer;// 贝塞尔曲线(创建一个圆)UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(100, 100)radius:98.fstartAngle:DEGREES(0)endAngle:DEGREES(360)clockwise:YES];// 获取pathlayer.path = path.CGPath;// 设置填充颜色为透明layer.fillColor = [UIColor clearColor].CGColor;// 使用POP动画_timer = [[GCDTimer alloc] initInQueue:[GCDQueue mainQueue]];[_timer event:^{CGFloat value1 = arc4random()%100/100.f;POPSpringAnimation *strokeAnimationEnd = \[POPSpringAnimation animationWithPropertyNamed:kPOPShapeLayerStrokeEnd];strokeAnimationEnd.toValue = @(value1);strokeAnimationEnd.springBounciness = 12.f;[layer pop_addAnimation:strokeAnimationEnd forKey:@"layerStrokeAnimation"];} timeInterval:1*NSEC_PER_SEC];[_timer start];
}@end