1、在很多APP中,我们都可以看见那些特效绚丽的滑动选项条,那么如何才能够简单,快速的实现那样的效果呢
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController{
NSMutableArray *btnArray
NSMutableArray *titleArray
}
@property (nonatomic,strong) UIView *customView
@property (nonatomic,strong) UIView *backView
@property (nonatomic,strong) UIButton *myButton
-(void)myButtonClcik:(id)sender
@end
第二步:在我们的额viewdidload方法中,或者自定义一个方法中创建我么的界面元素。《这里我引日了QuartzCore框架,是为了使用其layer属性》
[cpp] view plaincopy
#import "ViewController.h"
#import <QuartzCore/QuartzCore.h>
@interface ViewController ()
@end
@implementation ViewController
@synthesize customView
@synthesize backView
@synthesize myButton
//每行显示的button个数
#define kSelectNum 6
- (void)viewDidLoad
{
[super viewDidLoad]
// Do any additional setup after loading the view, typically from a nib.
customView = [[UIView alloc]initWithFrame:CGRectMake(20, 100, 900, 60)]
customView.backgroundColor = [UIColor blackColor]
//设置customView的样式,变为圆角
customView.layer.cornerRadius = 15.0f
customView.layer.masksToBounds = YES
//将customView add 到当前主View中
[self.view addSubview:customView]
//创建button的背景视图
backView = [[UIView alloc] initWithFrame:CGRectMake(5, 5, 95, 50)]
backView.backgroundColor = [UIColor blueColor]
//设置为圆角。以免造成重叠显示
backView.layer.cornerRadius = 15.0f
backView.layer.masksToBounds = YES
//将backView视图add到customView中
[customView addSubview:backView]
//创建button,首先button的个数是不固定的,因此我们需要动态的生成button
//创建数组,保存button的title
btnArray = [[NSMutableArray alloc]init]
titleArray = [[NSMutableArray alloc]initWithObjects:@"热播大片",@"最新更新",@"最热观看",@"美剧大片",@"韩剧频道",@"综艺娱乐", nil]
//动态生成button
for (int i = 0i <kSelectNumi ++){
myButton = [UIButton buttonWithType:UIButtonTypeCustom]
myButton.titleLabel.font = [UIFont boldSystemFontOfSize:20.0f]
[myButton setTitle:[titleArray objectAtIndex:i] forState:UIControlStateNormal]
[myButton setTitleColor:[UIColor grayColor] forState:UIControlStateNormal]
[myButton setTitleColor:[UIColor whiteColor] forState:UIControlStateSelected]
[myButton setFrame:CGRectMake(i%(kSelectNum + 1)*140+5, 5, 95, 50)]
[myButton addTarget:self action:@selector(myButtonClcik:) forControlEvents:UIControlEventTouchUpInside]
myButton.tag = i
[btnArray addObject:myButton]
[customView addSubview:myButton]
//设置默认选择的button.title的颜色
if(i == 0){
myButton.selected = YES
}
}
}
第三步:我们为button添加按钮点击事件,同时设置背景色滑动特效。
[cpp] view plaincopy
- (void)myButtonClcik:(id)sender{
//NSString *selectedBtn = [NSString stringWithFormat:@"%@",[titleArray objectAtIndex:button.tag]]
//UIAlertView *alert = [[UIAlertView alloc]initWithTitle:nil message:selectedBtn delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]
//[alert show]
//添加动画过度效果
[UIView beginAnimations:@"slowGlide" context:nil]
[UIView setAnimationDuration:0.3f]
//设置每次只能选择一个button
UIButton *button = (UIButton *)sender
if(!button.selected){
for (UIButton *eachBtn in btnArray) {
if(eachBtn.isSelected){
[eachBtn setSelected:NO]
}
}
[button setSelected:YES]
//设置点击那个按钮,那个按钮的背景改变为backView的颜色
[backView setFrame:button.frame]
}
[UIView commitAnimations]
}
最后成型,我们就可以根据我们的样式需要进行调整了。
在iOS平台,UINavigationBar可以通过设置tintColor来改变导航条的背景颜色,但是由于UIBarButtonItem没有文本颜色设置功能,所以如果将UINavigationBar的tintColor设置成whiteColor的话,文字显示就不怎么清晰了。这种情况网上一般建议通过建立一个UILabel,赋值给UINavigationItem的titleView属性,改变标题的颜色。建立一个UIButton,通过UIBarButtonItem的initWithCustomView方法创建UIBarButtonItem对象效果不尽人意吧。当然可以通过设置背景图片什么的,加强效果。但总体来说不如只改变文本颜色方便。iOS的Objective C提供了runtime函数,定义在objc目录下面。通过这些运行时库函数可以对系统定义的对象进行修改,比如增加方法,修改方法的代码地址....通过枚举UINavigationBar的子视图,发现显示UIBarButtonItem内容的是UINavigationButton,它有一个子视图类型为UIButtonLabel,UIButtonLabel继承自UILabel,UIButtonLabel类型本身没有重载setTextColor:方法,因此调用class_addMethod给UIButtonLabel类型增加一个setTextColor:方法,然后把传进来的color强制改成其他颜色,再调用UILabel的setTextColor:方法即可。欢迎分享,转载请注明来源:内存溢出
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