iOS实现抽屉效果

本文实例为大家分享了ios实现抽屉效果的具体代码，供大家参考，具体内容如下

抽屉效果：

#import "dragerviewcontroller.h"

#define screenw [uiscreen mainscreen].bounds.size.width

@interface dragerviewcontroller ()

@property (nonatomic, weak) uiview *leftv;
@property (nonatomic, weak) uiview *rightv;
@property (nonatomic, weak) uiview *mainv;

@end

@implementation dragerviewcontroller

- (void)viewdidload {
 [super viewdidload];

 //添加子控件
 [self setup];


 //添加手势
 uipangesturerecognizer *pan = [[uipangesturerecognizer alloc] initwithtarget:self action:@selector(pan:)];

 [self.mainv addgesturerecognizer:pan];


 //给控制器的view添加点按手势
 uitapgesturerecognizer *tap = [[uitapgesturerecognizer alloc] initwithtarget:self action:@selector(tap)];
 [self.view addgesturerecognizer:tap];
}

- (void)tap{
 //让mainv复位

 [uiview animatewithduration:0.5 animations:^{
 self.mainv.frame = self.view.bounds;
 }];

}



#define targetr 275
#define targetl -275
- (void)pan:(uipangesturerecognizer *)pan{

 //获取偏移量
 cgpoint transp = [pan translationinview:self.mainv];
 //为什么不使用transform,是因为我们还要去修改高度,使用transform,只能修改,x,y
 //self.mainv.transform = cgaffinetransformtranslate(self.mainv.transform, transp.x, 0);

 self.mainv.frame = [self framewithoffsetx:transp.x];
 //判断拖动的方向
 if(self.mainv.frame.origin.x > 0){
 //向右
 self.rightv.hidden = yes;
 }else if(self.mainv.frame.origin.x < 0){
 //向左
 self.rightv.hidden = no;
 }

 //当手指松开时,做自动定位.
 cgfloat target = 0;
 if (pan.state == uigesturerecognizerstateended) {

 if (self.mainv.frame.origin.x > screenw * 0.5 ) {
  //1判断在右侧
  //当前view的x有没有大于屏幕宽度的一半,大于就是在右侧
  target = targetr;
 }else if(cgrectgetmaxx(self.mainv.frame) < screenw * 0.5){
  //2.判断在左侧
  //当前view的最大的x有没有小于屏幕宽度的一半,小于就是在左侧
  target = targetl;
 }


 //计算当前mainv的frame.
 cgfloat offset = target - self.mainv.frame.origin.x;
 [uiview animatewithduration:0.5 animations:^{

  self.mainv.frame = [self framewithoffsetx:offset];
 }];


 }


 //复位
 [pan settranslation:cgpointzero inview:self.mainv];

}

#define maxy 100
//根据偏移量计算mainv的frame
- (cgrect)framewithoffsetx:(cgfloat)offsetx {

 nslog(@"offsetx===%f",offsetx);

 cgrect frame = self.mainv.frame;
 nslog(@"x====%f",frame.origin.x);
 frame.origin.x += offsetx;

 //当拖动的view的x值等于屏幕宽度时,maxy为最大,最大为100
 // 375 * 100 / 375 = 100

 //对计算的结果取绝对值
 cgfloat y = fabs( frame.origin.x * maxy / screenw);
 frame.origin.y = y;


 //屏幕的高度减去两倍的y值
 frame.size.height = [uiscreen mainscreen].bounds.size.height - (2 * frame.origin.y);

 return frame;
}


- (void)setup{

 //leftv
 uiview *leftv = [[uiview alloc] initwithframe:self.view.bounds];
 leftv.backgroundcolor = [uicolor bluecolor];
 self.leftv = leftv;
 [self.view addsubview:leftv];
 //rightv
 uiview *rightv = [[uiview alloc] initwithframe:self.view.bounds];
 rightv.backgroundcolor = [uicolor greencolor];
 self.rightv = rightv;
 [self.view addsubview:rightv];
 //mianv
 uiview *mainv = [[uiview alloc] initwithframe:self.view.bounds];
 mainv.backgroundcolor = [uicolor redcolor];
 self.mainv = mainv;
 [self.view addsubview:mainv];
}

@end

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。