编写带有点击特效的UIButton

效果：

源码：

//
//  ViewController.m
//  Button
//
//  Created by XianMingYou on 15/1/18.
//  Copyright (c) 2015年 XianMingYou. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@property (nonatomic, strong) UIButton    *button;
@property (nonatomic, strong) UIView      *showView;
@property (nonatomic, strong) UILabel     *showLabel;
@property (nonatomic, strong) UILabel     *staticLabel;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.view.backgroundColor = [UIColor blackColor];

    self.showView                        = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 300, 0)];
    self.showView.transform              = CGAffineTransformMakeRotation(45 * M_PI / 180.0);
    self.showView.userInteractionEnabled = NO;
    self.showView.backgroundColor        = [UIColor redColor];

    self.staticLabel               = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 130, 30)];
    self.staticLabel.text          = @"YouXianMing";
    self.staticLabel.font          = [UIFont fontWithName:@"HelveticaNeue-Thin" size:18.f];
    self.staticLabel.textAlignment = NSTextAlignmentCenter;
    self.staticLabel.textColor     = [UIColor redColor];

    self.showLabel               = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 130, 30)];
    self.showLabel.text          = @"YouXianMing";
    self.showLabel.alpha         = 0.f;
    self.showLabel.font          = [UIFont fontWithName:@"HelveticaNeue-Thin" size:18.f];
    self.showLabel.textAlignment = NSTextAlignmentCenter;
    self.showLabel.textColor     = [UIColor blackColor];

    // 完整显示按住按钮后的动画效果
    _button                     = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 130, 30)];
    _button.backgroundColor     = [UIColor clearColor];
    _button.layer.borderWidth   = 1.f;
    _button.layer.borderColor   = [UIColor redColor].CGColor;
    _button.layer.masksToBounds = YES;
    _button.center              = self.view.center;
    [self.view addSubview:_button];

    self.showView.center = CGPointMake(_button.frame.size.width / 2.f, _button.frame.size.height / 2.f);
    [_button addSubview:self.showView];

    self.staticLabel.center = CGPointMake(_button.frame.size.width / 2.f, _button.frame.size.height / 2.f);
    [_button addSubview:self.staticLabel];

    self.showLabel.center = CGPointMake(_button.frame.size.width / 2.f, _button.frame.size.height / 2.f);
    [_button addSubview:self.showLabel];

    // 按住按钮后没有松手的动画
    [_button addTarget:self
                action:@selector(scaleToSmall)
      forControlEvents:UIControlEventTouchDown | UIControlEventTouchDragEnter];

    // 按住按钮松手后的动画
    [_button addTarget:self
                action:@selector(scaleAnimation)
      forControlEvents:UIControlEventTouchUpInside];

    // 按住按钮后拖拽出去的动画
    [_button addTarget:self
                action:@selector(scaleToDefault)
      forControlEvents:UIControlEventTouchDragExit];
}

- (void)scaleToSmall {
    [UIView animateWithDuration:0.5f animations:^{
        self.showView.bounds          = CGRectMake(0, 0, 300, 90);
        self.showView.backgroundColor = [UIColor redColor];
        self.showLabel.alpha          = 1.f;
    } completion:^(BOOL finished) {
        NSLog(@"%d", finished);
    }];
}

- (void)scaleAnimation {
    // 获取到当前的状态
    self.showView.bounds                = ((CALayer *)self.showView.layer.presentationLayer).bounds;
    self.showView.layer.backgroundColor = ((CALayer *)self.showView.layer.presentationLayer).backgroundColor;
    self.showLabel.alpha                = ((CALayer *)self.showLabel.layer.presentationLayer).opacity;

    // 移除之前的动画状态
    [self.showView.layer removeAllAnimations];

    // 做全新的动画
    [UIView animateWithDuration:0.25f animations:^{
        self.showView.bounds          = CGRectMake(0, 0, 300, 0);
        self.showView.backgroundColor = [UIColor clearColor];
        self.showLabel.alpha          = 0.f;
    } completion:^(BOOL finished) {

    }];
}

- (void)scaleToDefault {
    // 获取到当前的状态
    self.showView.bounds                = ((CALayer *)self.showView.layer.presentationLayer).bounds;
    self.showView.layer.backgroundColor = ((CALayer *)self.showView.layer.presentationLayer).backgroundColor;
    self.showLabel.alpha                = ((CALayer *)self.showLabel.layer.presentationLayer).opacity;

    // 移除之前的动画状态
    [self.showView.layer removeAllAnimations];

    // 做全新的动画
    [UIView animateWithDuration:0.25f animations:^{
        self.showView.bounds          = CGRectMake(0, 0, 300, 0);
        self.showView.backgroundColor = [UIColor clearColor];
        self.showLabel.alpha          = 0.f;
    } completion:^(BOOL finished) {

    }];
}

@end

核心源码：