iOS仿网易简单头部滚动效果
本文实例为大家分享了iOS仿网易滚动效果片展示的具体代码,供大家参考,具体内容如下
仿网易的主要思想为:
1. 设置好按钮与线的宽度,
2. 将所需要的标题传入并生成按钮
3. 在点击的时候,通过计算偏移量,将自身进行偏移
4. 偏移量的设置需要注意不能小于0并且不成大于contengsize-frame的宽度
具体代码如下,可直接使用,需要注意的是需要先设置宽度,再传标题数组才可自动调整,否则会固定为默认的60
另外,BtnArr与linelabel设置为readonly比较合理,不过这里还需再进行研究,不要强制使用这两个属性即可
头文件如下:
// // TitleScrollView.h // @author 陈晋添 // // Created by jkc on 16/7/14. // Copyright © 2016年 cjt. All rights reserved. // #import <UIKit/UIKit.h> @interface TitleScrollView : UIScrollView typedef void(^sectionTitleViewBlock)(NSInteger num); @property (nonatomic, strong) NSMutableArray *BtnArr; //形成的按钮数组 @property (nonatomic, strong) UILabel *linelabel; //底部line @property (nonatomic, strong) sectionTitleViewBlock clickBolck; //block回调 @property (nonatomic, assign) NSInteger LineWidth; //设置线的长度 @property (nonatomic, assign) NSInteger ButtonWidth; //按钮的宽度 /** * 通过标题数组进行设置头部滚动条 * * @param array 需要加入的标题 */ -(void)AddArrView:(NSArray*)array; /** * 可直接用代码设置索引位置 * * @param index 索引位置 */ -(void)setByIndex:(NSInteger)index; @end
.m文件如下
// // TitleScrollView.m // @author 陈晋添 // // Created by jkc on 16/7/14. // Copyright © 2016年 cjt. All rights reserved. // #import "TitleScrollView.h" #define TitleBtnTag 300 //button的tag值 @implementation TitleScrollView -(instancetype)initWithFrame:(CGRect)frame { if (self = [super initWithFrame:frame]) { //初始化自身 [self setBackgroundColor:[UIColor whiteColor]]; self.showsHorizontalScrollIndicator = false; _ButtonWidth = _LineWidth = 60; self.linelabel = [[UILabel alloc] initWithFrame:CGRectMake(0, self.frame.size.height-1.5, _LineWidth, 1.5)]; [self.linelabel setBackgroundColor:TintColor]; [self addSubview:self.linelabel]; } return self; } -(void)AddArrView:(NSArray*)array { self.BtnArr = [NSMutableArray array]; for (int i=0; i<array.count; i++) { //初始化所有btn UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(i*_ButtonWidth, 0, _ButtonWidth,34)]; [btn addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside]; btn.titleLabel.font = [UIFont systemFontOfSize:12]; btn.titleLabel.textAlignment = NSTextAlignmentCenter; [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [btn setTitle:array[i] forState:UIControlStateNormal]; btn.tag = TitleBtnTag+i; [self addSubview:btn]; [self.BtnArr addObject:btn]; } //根据button个数设置内部大小 [self setContentSize:CGSizeMake(array.count*_ButtonWidth, CGRectGetHeight(self.frame))]; } -(void)click:(UIButton*)button { //把所有的btn样式重置 for (UIButton *btn in self.BtnArr) { btn.titleLabel.font = [UIFont systemFontOfSize:12]; btn.titleLabel.textAlignment = NSTextAlignmentCenter; [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; } //特殊设置点击的button样式 [button setTitleColor:[UIColor orangeColor] forState:UIControlStateNormal]; //计算获得偏移量, CGFloat index = (button.tag-TitleBtnTag)*_ButtonWidth-(self.frame.size.width-_ButtonWidth)/2; index = index<0?0:index; index = index>self.contentSize.width-CGRectGetWidth(self.frame)?self.contentSize.width-CGRectGetWidth(self.frame):index; //动画效果偏移 [self setContentOffset:CGPointMake(index, 0) animated:YES]; [UIView animateWithDuration:0.3 animations:^{ self.linelabel.frame = CGRectMake((button.tag-TitleBtnTag)*_ButtonWidth, self.frame.size.height-1, _LineWidth, 1); }]; self.clickBolck(button.tag); } //通过外部代码直接设置索引 -(void)setByIndex:(NSInteger)nowindex { UIButton *button = self.BtnArr[nowindex]; [self click:button]; } @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海外IDC网。
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