////  PulsingView.h//  PulsingView////  Created by YouXianMing on 14/10/29.//  Copyright (c) 2014年 YouXianMing. All rights reserved.//#import <UIKit/UIKit.h>@interface PulsingView : UIView/** *  startScale与endScale需要设置值 */@property (nonatomic, assign) CGFloat  startScale;@property (nonatomic, assign) CGFloat  endScale;/** *  动画时间 */@property (nonatomic, assign) NSTimeInterval duration;/** *  最高程度的alpha */@property (nonatomic, assign) CGFloat  maxAlpha;/** *  用来做动画的view */@property (nonatomic, strong) UIView  *inputView;/** *  做动画 */- (void)startAnimation;@end

////  PulsingView.m//  PulsingView////  Created by YouXianMing on 14/10/29.//  Copyright (c) 2014年 YouXianMing. All rights reserved.//#import "PulsingView.h"@interface PulsingView ()@end@implementation PulsingView- (void)startAnimation {    CGFloat tmpStartScale = (_startScale < 0 ? 0.5 : _startScale);    CGFloat tmpEndScale   = (_endScale < 0 ? 2 : _endScale);        _inputView.transform  = CGAffineTransformMake(tmpStartScale, 0, 0, tmpStartScale, 0, 0);    _inputView.alpha      = ((_maxAlpha <= 0 || _maxAlpha > 1) ? 1: _maxAlpha);        [UIView animateWithDuration:(_duration <= 0 ? 1.f : _duration)                          delay:0.f options:UIViewAnimationOptionCurveEaseOut animations:^{                              _inputView.transform = CGAffineTransformMake(tmpEndScale, 0, 0, tmpEndScale, 0, 0);                              _inputView.alpha     = 0.f;                          } completion:nil];}@synthesize inputView = _inputView;- (void)setInputView:(UIView *)inputView {    _inputView       = inputView;    inputView.frame  = inputView.bounds; // 重设inputView的frame值    self.bounds      = inputView.bounds; // 重设view的bounds        // 先删除掉所有的子view    [[self subviews] enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {        UIView *tmp = (UIView *)obj;        [tmp removeFromSuperview];    }];        [self addSubview:inputView];}- (UIView *)inputView {    return _inputView;}@end

////  ViewController.m//  PulsingView////  Created by YouXianMing on 14/10/29.//  Copyright (c) 2014年 YouXianMing. All rights reserved.//#import "ViewController.h"#import "PulsingView.h"#import "YXGCD.h"@interface ViewController ()@property (nonatomic, strong) NSTimer     *timer;@property (nonatomic, strong) PulsingView *pulsingView;@property (nonatomic, strong) UIView      *circleView;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // 设置背景    self.view.backgroundColor      = [UIColor blackColor];     // 用来显示的view    _circleView                    = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];    _circleView.backgroundColor    = [self randomColor];    _circleView.layer.cornerRadius = 50.f;        // 脉冲view    _pulsingView            = [PulsingView new];    _pulsingView.inputView  = _circleView;    _pulsingView.startScale = 0.1f;    _pulsingView.duration   = 1.f;    _pulsingView.center     = self.view.center;    [self.view addSubview:_pulsingView];        // 定时器    _timer = [NSTimer scheduledTimerWithTimeInterval:1.2f                                              target:self                                            selector:@selector(animationTimerEvent)                                            userInfo:nil                                             repeats:YES];}- (void)animationTimerEvent {    _circleView.backgroundColor = [self randomColor];    _pulsingView.endScale       = arc4random()%200/100.f + 1.f;    [_pulsingView startAnimation];}- (UIColor *)randomColor {    return [UIColor colorWithRed:arc4random()%255/255.f                           green:arc4random()%255/255.f                            blue:arc4random()%255/255.f                           alpha:1.f];}@end