iOS 实现简易抽屉效果和双边抽屉的效果

 

iOS实现简易抽屉效果,代码:

@interface ViewController () {
UIView* _leftView;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
_leftView = [[UIView alloc] init];
//把左侧边的view先隐藏
_leftView.frame = CGRectMake(-200, 0, 200, self.view.frame.size.height);
_leftView.backgroundColor = [UIColor greenColor];
[self.view addSubview:_leftView];
UIPanGestureRecognizer* pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
[self.view addGestureRecognizer:pan];
}
- (void)handlePan:(UIPanGestureRecognizer*) recognizer {
CGPoint translation = [recognizer translationInView:self.view];
//增量后的x坐标位置
CGFloat Xresult = translation.x + _leftView.frame.origin.x;
//向右
if (translation.x >= 0) {
//leftView已全部拉出,则无法再向右
if (_leftView.frame.origin.x >= 0 || Xresult >= 0) {
_leftView.frame = CGRectMake(0, 0, 200, self.view.frame.size.height);
return;
}
} else if (translation.x < 0) {//向左
//leftView已全部收回,则无法再向左
if (_leftView.frame.origin.x <= -200 || Xresult <= -200) {
_leftView.frame = CGRectMake(-200, 0, 200, self.view.frame.size.height);
return;
}
}
CGRect frame = _leftView.frame;
frame.origin.x += translation.x;
_leftView.frame = frame;
//清空移动的距离,这是关键
[recognizer setTranslation:CGPointZero inView:recognizer.view];
//做弹回效果,以中轴为界限
if (recognizer.state == UIGestureRecognizerStateEnded) {
if (_leftView.frame.origin.x > -100) {
[self closeView:NO];
} else {
[self closeView:YES];
}
}
}
- (void)closeView:(BOOL)close {
if (close) {
[self moveView:CGRectMake(-200, 0, 200, self.view.frame.size.height)];
} else {
[self moveView:CGRectMake(0, 0, 200, self.view.frame.size.height)];
}
}
- (void)moveView:(CGRect)frame {
[UIView animateWithDuration:0.3 animations:^{
_leftView.frame = frame;
} completion:^(BOOL finished) {
}];
}

iOS实现双边抽屉效果,代码:

#import "PathView.h"
#import "UIView+Additions.h"
@implementation PathView
- (instancetype)init {
self = [super init];
if (self) {
[self setupGestureRecognizer];
}
return self;
}
- (void)setupGestureRecognizer {
UIPanGestureRecognizer* pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
[self addGestureRecognizer:pan];
}
- (void)handlePan:(UIPanGestureRecognizer*)recognizer {
CGPoint translation = [recognizer translationInView:self];
CGFloat Xresult = translation.x + self.left;
if (translation.x >= 0) {//向右
if (self.left >= _leftWidth || Xresult >= _leftWidth) {
self.frame = CGRectMake(_leftWidth, 0, self.width, self.height);
return;
}
}
else if (translation.x < 0) {//向左
if (self.left <= -_rightWidth || Xresult <= -_rightWidth) {
self.frame = CGRectMake(-_rightWidth, 0, self.width, self.height);
return;
}
}
self.left += translation.x;
if (recognizer.state == UIGestureRecognizerStateEnded) {
if (self.left > _leftWidth / 2) {
[self openLeft:YES openRight:NO];
}
else if (self.left < -(_rightWidth / 2)) {
[self openLeft:NO openRight:YES];
}
else {
[self openLeft:NO openRight:NO];
}
}
//清空移动的距离
[recognizer setTranslation:CGPointZero inView:recognizer.view];
}
- (void)openLeft:(BOOL)left openRight:(BOOL)right {
if (!left && !right) {
[self moveView:CGRectMake(0, 0, self.width, self.height)];
} else if (!left && right) {
[self moveView:CGRectMake(-_rightWidth, 0, self.width, self.height)];
} else if (left && !right) {
[self moveView:CGRectMake(_leftWidth, 0, self.width, self.height)];
}
}
- (void)moveView:(CGRect)frame {
[UIView animateWithDuration:0.3 animations:^{
self.frame = frame;
} completion:^(BOOL finished) {
}];
}

上面是实现的具体内容,所以不做多少注释,只不过把手势移到view里面,让view自己改变自己的frame;再有就是添加了两个属性,来指定左右两边各自抽屉抽出的宽度,某一边不需要,只要设置为0就好了。

 

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