iOS UIView动画详解(Objective-C)

我在之前的一篇博客中《iOS
UIView动画详解(Swift)》讲解了使用Swift来实现UIView类下面提供的多种动画效果，如位置动画、旋转动画、缩放动画、颜色动画、透明度动画等等。为了这个题目的完整性，今天我使用Objective-C来完全重写以上的所有的动画。项目案例已经上传至：https://github.com/chenyufeng1991/iOS-UIView-Animation
中的Animation-OC文件夹下，另一个目录下则是Swift实现的动画。

（1）位置动画

PositionAnimation可以实现View的移动，最简单的就是X轴，Y轴的移动。这里实现几个小方块的移动。

[objc] view
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#import "PositionViewController.h"

@interface PositionViewController ()

@property (weak, nonatomic) IBOutlet UIView *redSquare;

@property (weak, nonatomic) IBOutlet UIView *greenSquare;

@end

@implementation PositionViewController

- (void)viewDidLoad {

[super viewDidLoad];

}

- (void)viewWillAppear:(BOOL)animated{

[super viewWillAppear:animated];

[UIView animateWithDuration:2 animations:^{

self.redSquare.frame = CGRectMake(self.redSquare.frame.origin.x, 400, self.redSquare.bounds.size.width, self.redSquare.bounds.size.height);

self.greenSquare.frame = CGRectMake(200, 500, self.greenSquare.bounds.size.width, self.greenSquare.bounds.size.height);

}];

}

@end

（2）透明度动画

透明度动画可以让某个View的透明度在0-1之间改变。透明度为0表示全透明，看不见了。透明度为1表示和正常情况下一样。

[objc] view
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#import "OpacityViewController.h"

@interface OpacityViewController ()

@property (weak, nonatomic) IBOutlet UIView *redSquare;

@end

@implementation OpacityViewController

- (void)viewDidLoad {

[super viewDidLoad];

}

- (void)viewWillAppear:(BOOL)animated{

[super viewWillAppear:animated];

[UIView animateWithDuration:2 animations:^{

self.redSquare.alpha = 0.3;

}];

}

@end

（3）缩放动画

缩放动画可以让一个View的大小发生改变，按比例的放大缩小。

[objc] view
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#import "ScaleViewController.h"

@interface ScaleViewController ()

@property (weak, nonatomic) IBOutlet UIView *redSquare;

@end

@implementation ScaleViewController

- (void)viewDidLoad {

[super viewDidLoad];

}

- (void)viewWillAppear:(BOOL)animated{

[super viewWillAppear:animated];

[UIView animateWithDuration:2 animations:^{

//宽高缩放比；

self.redSquare.transform = CGAffineTransformMakeScale(2, 3);

}];

}

@end

（4）颜色动画

颜色动画可以让一个View在一个时间间隔内发生颜色的渐变，进行颜色的过渡。

[objc] view
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#import "ColorViewController.h"

@interface ColorViewController ()

@property (weak, nonatomic) IBOutlet UIView *greenSquare;

@end

@implementation ColorViewController

- (void)viewDidLoad {

[super viewDidLoad];

}

- (void)viewWillAppear:(BOOL)animated{

[super viewWillAppear:animated];

[UIView animateWithDuration:2 animations:^{

//宽高缩放比；

self.greenSquare.backgroundColor = [UIColor brownColor];

}];

}

@end

（5）旋转动画

可以让某个View绕圆点进行旋转。

[objc] view
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#import "RotationViewController.h"

@interface RotationViewController ()

@property (weak, nonatomic) IBOutlet UIView *greenSquare;//旋转一次；

@property (weak, nonatomic) IBOutlet UIView *redSquare;//旋转无数次；

@end

@implementation RotationViewController

- (void)viewDidLoad {

[super viewDidLoad];

}

- (void)viewWillAppear:(BOOL)animated{

[super viewWillAppear:animated];

[self spinGreenSquare];

[self spinRedSquare];

}

- (void)spinGreenSquare{

[UIView animateWithDuration:2 animations:^{

self.greenSquare.transform = CGAffineTransformRotate(self.greenSquare.transform, M_PI);//一个PI，180度；

} completion:^(BOOL finished) {

}];

}

- (void)spinRedSquare{

[UIView animateWithDuration:1 delay:0 options:UIViewAnimationOptionCurveLinear animations:^{

self.redSquare.transform = CGAffineTransformRotate(self.redSquare.transform, 360);//一个PI，180度；

} completion:^(BOOL finished) {

[self spinRedSquare];

}];

}

@end

（6）重复动画

该动画可以让某个动画过程反复执行。

[objc] view
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#import "RepeatViewController.h"

@interface RepeatViewController ()

@property (weak, nonatomic) IBOutlet UIView *greenSquare;

@property (weak, nonatomic) IBOutlet UIView *redSquare;

@end

@implementation RepeatViewController

- (void)viewDidLoad {

[super viewDidLoad];

}

- (void)viewWillAppear:(BOOL)animated{

[super viewWillAppear:animated];

[UIView animateWithDuration:2 delay:0 options:UIViewAnimationOptionRepeat animations:^{

self.greenSquare.frame = CGRectMake(250, self.greenSquare.frame.origin.y, self.greenSquare.frame.size.width, self.greenSquare.frame.size.height);

} completion:^(BOOL finished) {

}];

[UIView animateWithDuration:2 delay:0 options:UIViewAnimationOptionRepeat|UIViewAnimationOptionAutoreverse animations:^{

self.redSquare.frame = CGRectMake(250, self.redSquare.frame.origin.y, self.redSquare.frame.size.width, self.redSquare.frame.size.height);

} completion:^(BOOL finished) {

}];

}

@end

（7）缓冲动画

这里主要使用了贝塞尔曲线的效果来改变View动画的速率效果。大家可以实践一下。

[objc] view
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#import "EasingViewController.h"

@interface EasingViewController ()

@property (weak, nonatomic) IBOutlet UIView *greenSquare;

@property (weak, nonatomic) IBOutlet UIView *redSquare;

@end

@implementation EasingViewController

- (void)viewDidLoad {

[super viewDidLoad];

}

- (void)viewWillAppear:(BOOL)animated{

[super viewWillAppear:animated];

//主要是设置options这个参数；

[UIView animateWithDuration:2 delay:0 options:UIViewAnimationOptionCurveEaseIn animations:^{

self.greenSquare.frame = CGRectMake(250, self.greenSquare.frame.origin.y, self.greenSquare.frame.size.width, self.greenSquare.frame.size.height);

} completion:nil];

[UIView animateWithDuration:2 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{

self.redSquare.frame = CGRectMake(250, self.redSquare.frame.origin.y, self.redSquare.frame.size.width, self.redSquare.frame.size.height);

} completion:nil];

}

@end

（8）弹簧动画

该动画执行过程中类似弹簧的真实效果，你可以设置弹簧的阻尼和初始速度来达到非常逼真的弹簧抖动。

[objc] view
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#import "SpringViewController.h"

@interface SpringViewController ()

@property (weak, nonatomic) IBOutlet UIView *greenSquare;

@property (weak, nonatomic) IBOutlet UIView *redSquare;

@end

@implementation SpringViewController

- (void)viewDidLoad {

[super viewDidLoad];

}

- (void)viewWillAppear:(BOOL)animated{

[super viewWillAppear:animated];

//通过设置参数即可改变不同的状态；

[UIView animateWithDuration:2 delay:0.5 usingSpringWithDamping:0.2 initialSpringVelocity:0 options:UIViewAnimationOptionTransitionNone animations:^{

self.greenSquare.frame = CGRectMake(250, self.greenSquare.frame.origin.y, self.greenSquare.frame.size.width, self.greenSquare.frame.size.height);

} completion:nil];

[UIView animateWithDuration:2 delay:0.5 usingSpringWithDamping:0.2 initialSpringVelocity:1 options:UIViewAnimationOptionTransitionNone animations:^{

self.redSquare.frame = CGRectMake(250, self.redSquare.frame.origin.y, self.redSquare.frame.size.width, self.redSquare.frame.size.height);

} completion:nil];

}

@end

（9）图片旋转

在我们实际的需求中，我们可能需要让图片在移动旋转之前就处于左转90度、右转90度、旋转180度的状态，然后在此基础上再进行其他的动画。实现如下：

[objc] view
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#import "ImageRotationViewController.h"

#define kScreenWidth [[UIScreen mainScreen] bounds].size.width

#define kScreenHeight [[UIScreen mainScreen] bounds].size.height

/**

* 在该示例中对UIImage进行旋转，注意不是对UIImageView旋转，这可以满足更多自定义的需求；

*/

@interface ImageRotationViewController ()

@end

@implementation ImageRotationViewController

- (void)viewDidLoad {

[super viewDidLoad];

/**

UIImageOrientationUp, // default orientation

UIImageOrientationDown, // 180 deg rotation

UIImageOrientationLeft, // 90 deg CCW

UIImageOrientationRight, // 90 deg CW

UIImageOrientationUpMirrored, // as above but image mirrored along other axis. horizontal flip

UIImageOrientationDownMirrored, // horizontal flip

UIImageOrientationLeftMirrored, // vertical flip

UIImageOrientationRightMirrored, // vertical flip

*/

UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, kScreenHeight / 2, 80, kScreenWidth)];

UIImage *image = [UIImage imageNamed:@"1"];

/**

* 以下方法让一张图片一开始就处于旋转状态，而不是正放的状态；注意是对UIImage的操作，而不是对UIimageView控件的操作；最后再把image放入控件即可。

*/

UIImage *imageRotate = [UIImage imageWithCGImage:image.CGImage scale:1 orientation:UIImageOrientationLeft];

[imageView setImage:imageRotate];

[self.view addSubview:imageView];

[UIView animateWithDuration:2 animations:^{

imageView.transform = CGAffineTransformRotate(imageView.transform, M_PI_2);

imageView.frame = CGRectMake(0, 64, kScreenWidth, 80);

}];

}

@end

这里实现的动画都是非常的简单，大家可以通过下载代码自己尝试一下。后续我会给大家讲解更为高级炫酷的动画。尽请期待。