6.26 iOS开发Delegate使用

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1.定义协议，定义方法，定义属性

#import <UIKit/UIKit.h>#define kTitleViewH 50@protocol MyOrderTopViewDelegate <NSObject>@optional-(void)didSelectedIndex:(NSInteger)tag;@end@interface MyOrderTitleView : UIView- (instancetype)initWithFrame:(CGRect)frame titles:(NSArray*)titles;@property(nonatomic,weak) id<MyOrderTopViewDelegate> delegate;@end

2.判断代理是否实现

#import "MyOrderTitleView.h"#import "HWDConstant.h"#import "UIViewExt.h"@interface MyOrderTitleView ()/** 标签栏底部的红色指示器 */@property (nonatomic, weak) UIView *indicatorView;/** 当前选中的按钮 */@property (nonatomic, weak) UIButton *selectedButton;/** 顶部的所有标签 */@property (nonatomic, strong) NSArray *titlesViewArr;@end@implementation MyOrderTitleView- (instancetype)initWithFrame:(CGRect)frame titles:(NSArray*)titles{    self=[super initWithFrame:frame];    if (self) {        self.titlesViewArr=titles;        [self setupTitlesView:titles];    }    return self;}- (void)setupTitlesView:(NSArray*)titles{    //标签栏整体    self.backgroundColor = [[UIColor whiteColor] colorWithAlphaComponent:1.0];    //下面的指示器view    UIView *indicatorView = [[UIView alloc] init];    self.indicatorView=indicatorView;    indicatorView.backgroundColor = DTButtonColor;    indicatorView.height = 2;    indicatorView.tag = -1;    indicatorView.y = kTitleViewH-1;    [self addSubview:indicatorView];        // 内部子视图空间    CGFloat width = KScreenWidth / titles.count;    CGFloat height = 50;    for (NSInteger i = 0; i<titles.count; i++) {        UIButton *button = [[UIButton alloc] init];        button.tag = i;        button.height = height;        button.width = width;        button.x = i * width;        [button setTitleEdgeInsets:UIEdgeInsetsMake(5, 0, 0, 0)];        [button setTitle:titles[i] forState:UIControlStateNormal];        [button setTitleColor:[UIColor lightGrayColor] forState:UIControlStateNormal];        [button setTitleColor:DTButtonColor forState:UIControlStateDisabled];        button.titleLabel.font = [UIFont boldSystemFontOfSize:15];        [button addTarget:self action:@selector(titleClick:) forControlEvents:UIControlEventTouchUpInside];        [self addSubview:button];                        // 默认点击了第一个按钮        if (i == 0) {            button.enabled = NO;            self.selectedButton = button;            // 让按钮内部的label根据文字内容来计算尺寸            [button.titleLabel sizeToFit];            indicatorView.width = width-30;            indicatorView.centerX = button.centerX;        }    }}- (void)titleClick:(UIButton *)button{    // 修改按钮状态    self.selectedButton.enabled = YES;    button.enabled = NO;    self.selectedButton = button;        // 动画    [UIView animateWithDuration:0.25 animations:^{        self.indicatorView.width = KScreenWidth/self.titlesViewArr.count-30;        self.indicatorView.centerX = button.centerX;    }];        // 滚动//    CGPoint offset = self.contentView.contentOffset;//    offset.x = button.tag * self.contentView.width;//    [self.contentView setContentOffset:offset animated:YES];    if ([self.delegate respondsToSelector:@selector(didSelectedIndex:)]) {        [self.delegate didSelectedIndex:button.tag];    }    }@end

3.遵守协议，成为代理，实现方法

#import "MyOrderViewController.h"#import "HWDConstant.h"#import "MyOrderTitleView.h"@interface MyOrderViewController ()<MyOrderTopViewDelegate>@end@implementation MyOrderViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.    self.view.backgroundColor= DefaultColor;        MyOrderTitleView * orderTitleView=[[MyOrderTitleView alloc] initWithFrame:CGRectMake(0, 64, KScreenWidth, kTitleViewH) titles:@[@"全部订单",@"未完成",@"已完成"]];    orderTitleView.delegate=self;    [self.view addSubview:orderTitleView];    }- (void)didSelectedIndex:(NSInteger)tag{    NSLog(@"%ld",(long)tag);}@end

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