项目基本完成，需要加占位图，界面众多，又不可能一个个加......能否利用runtime及oc特性解决问题呢. 实现思路，UIVIewController扩展加属性，加方法，自定义占位图，在需要的时候，一句话加载占位图。
###自定义占位视图
.h 使用枚举列举所有用到占位图的情况包括隐藏
typedef enum : NSUInteger {
NoNetPlacehoder, //无网路
NoProductPlacehoder, // 无产品
NoCouponPlacehoder, // 无优惠券
NoBanckCardPlacehoder, // 无银行卡
NoHistoryPlacehoder, // 无历史
NoCollectionPllacehoder, //无收藏
NoAddressPlacehoder, // 无地址
NoOrderPlacehoder, // 无订单
NoSearchDataPlacehoder, // 无搜索结果
NoFitCardPlacehoder, // 无健身卡
NocraftsmanPlaceHoder, //无手艺人
NovenuesPlaceHoder, //无场馆
Hidden, // 隐藏
} PlaceHoderImageViewtype;
#import <UIKit/UIKit.h>
@interface PlacehoderView : UIImageView
+ (instancetype)shareInstance;
- (void)showAndtype:(PlaceHoderImageViewtype )placehoderType;
@end
.m
// Created by bf on 2017/8/15.
// Copyright © 2017年 xuqq. All rights reserved.
//
#import "PlacehoderView.h"
@interface PlacehoderView ()
@property (nonatomic, strong)UIImageView *imageView;
@property (nonatomic, strong)UILabel *tipLabel;
@property (nonatomic, copy) NSArray *imageArray;
@property (nonatomic, copy) NSArray *tipArray;
@end
@implementation PlacehoderView
- (NSArray *)imageArray{
if (!_imageArray) {
_imageArray = @[@"placeholder_network_anomaly",
@"placeholder_product",
@"placeholder_recruitment",
@"placeholder_bank_card",
@"placeholder_browsing_history",
@"placeholder_attention",
@"placeholder_address",
@"placeholder_order",
@"placeholder_product",
@"placeholder_fitness_cards",
@"placeholder_craftsman",
@"placeholder_venues"];
}
return _imageArray;
}
- (NSArray *)tipArray{
if (!_tipArray) {
_tipArray = @[@"你的网络好像不太给力\n请查看网络设置或稍后再试",
@"还没哟相关产品哦",
@"你还没有领取优惠券哦",
@"还没有添加银行卡哦",
@"你还没有浏览过产品呢",
@"你还没有收藏过产品呢",
@"你还没有添加常用地址哦",
@"还没有相关订单哦",
@"暂时没有搜到相关结果\n换个关键词试试吧～",
@"你还没有购买过建设卡哦",
@"你的附近没有手艺人哦",
@"你的附近没有场馆哦"];
}
return _tipArray;
}
+ (instancetype)shareInstance{
// static
PlacehoderView *placeHoderView = placeHoderView = [[PlacehoderView alloc]initWithFrame:CGRectMake(0, 64, SCREENWIDTH, SCREENHEIGHT - 64)];
// static dispatch_once_t once;
// dispatch_once(&once, ^{
// });
return placeHoderView;
}
- (instancetype)initWithFrame:(CGRect)frame{
if (self = [super initWithFrame: frame]) {
[self initUI];
}
return self;
}
- (void)initUI{
UIView *backView = [MyView uiview:0 bColor:[UIColor clearColor] rect:self.bounds];
[self addSubview:backView];
self.imageView = [[UIImageView alloc]initWithFrame:CGRectMake((SCREENWIDTH - wight(430))*0.5, (self.xmg_height - wight(430) - wight(120) - wight(30))*0.1, wight(430), wight(430))];
[self addSubview:self.imageView];
self.tipLabel = [MyView label:@"" tColor:QIANGAR font:[UIFont systemFontOfSize:wight(30)] rect:CGRectMake(wight(30), self.imageView.xmg_bottom , SCREENWIDTH - wight(60), wight(90))];
self.tipLabel.numberOfLines = 0;
[self addSubview:self.tipLabel];
self.tipLabel.textAlignment = NSTextAlignmentCenter ;
self.userInteractionEnabled = NO;
self.hidden = YES;
}
//显示特定 活着隐藏占位图
- (void)showAndtype:(PlaceHoderImageViewtype)placehoderType{
if (placehoderType == Hidden) {
self.hidden = YES;
}else{
self.hidden = NO;
self.imageView.frame = CGRectMake((SCREENWIDTH - wight(430))*0.5, (self.xmg_height - wight(430) - wight(120) - wight(30))*0.2, wight(430), wight(430));
self.tipLabel.frame = CGRectMake(wight(30), self.imageView.xmg_bottom , SCREENWIDTH - wight(60), wight(90));
self.imageView.image = [UIImage imageNamed:self.imageArray[placehoderType]];
self.tipLabel.text = self.tipArray[placehoderType];
}
}
@end
###UIViewController+PlaceHoder .h 添加方法 及属性
// Created by bf on 2017/8/15.
// Copyright © 2017年 xuqq. All rights reserved.
//
#import <UIKit/UIKit.h>
#import "PlacehoderView.h"
@interface UIViewController (PlaceHoder)
@property (nonatomic, strong)PlacehoderView *placehoderView;
- (void)showPlaceHoderandType:(PlaceHoderImageViewtype)type withFrame:(CGRect )frame;
@end
.m 实现自定义属性及接口方法
// Created by bf on 2017/8/15.
// Copyright © 2017年 xuqq. All rights reserved.
//
#import "UIViewController+PlaceHoder.h"
@implementation UIViewController (PlaceHoder)
static void * MyObjectMyCustomPorpertyKey = (void *)@"MyObjectMyCustomPorpertyKey";
- (void)showPlaceHoderandType:(PlaceHoderImageViewtype)type withFrame:(CGRect)frame{
if (!self.placehoderView) {
self.placehoderView = [[PlacehoderView alloc]initWithFrame:CGRectMake(frame.origin.x, frame.origin.y + wight(240), frame.size.width, frame.size.height -wight(240))];
}
[self.view addSubview:self.placehoderView];
// self.placehoderView.frame = CGRectMake(frame.origin.x, frame.origin.y + wight(120), frame.size.width, frame.size.height -wight(120));
[self.placehoderView showAndtype:type];
}
- (PlacehoderView *)placehoderView
{
return objc_getAssociatedObject(self, MyObjectMyCustomPorpertyKey);
}
- (void)setPlacehoderView:(PlacehoderView *)placehoderView{
objc_setAssociatedObject(self, MyObjectMyCustomPorpertyKey, placehoderView, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
@end
#使用 [self showPlaceHoderandType:NocraftsmanPlaceHoder withFrame:self.tableView.frame];两个参数，一个占位图类型，一个需要加载视图的frame。
- (void)loadAndlocation{
self.page = 1;
NSString *uid = [[NSUserDefaults standardUserDefaults]objectForKey:USERID];
[NetWorkManager getnearbyPersonwithlng:[NSString stringWithFormat:@"%g",self.lng]
withlat:[NSString stringWithFormat:@"%g",self.lat]
withp:[NSString stringWithFormat:@"%ld",self.page]
uid:uid
name:nil
success:^(BaseResponse *response) {
if ([response.code isEqualToString:@"1000"]) {
NSArray *array = response.data;
NSMutableArray *temp = [NSMutableArray arrayWithCapacity:array.count];
for (NSInteger index = 0; index < array.count; index ++) {
CrafsmanJianjieModel *model = [CrafsmanJianjieModel mj_objectWithKeyValues:array[index]];
[temp addObject:model];
}
if (array.count) {
self.persons = [temp copy];
// 结束刷新
[self.tableView.mj_header endRefreshing];
[self.tableView.mj_footer endRefreshing];
[self.tableView reloadData];
[self showPlaceHoderandType:Hidden withFrame:self.tableView.frame];
}else{
[self showPlaceHoderandType:NocraftsmanPlaceHoder withFrame:self.tableView.frame];
[self.tableView.mj_header endRefreshing];
[self.tableView.mj_footer endRefreshing];
}
}
} fail:^(NSError *error) {
self.persons = @[];
[self.tableView reloadData];
[self showPlaceHoderandType:NoNetPlacehoder withFrame:self.tableView.frame];
[self.tableView.mj_header endRefreshing];
[self.tableView.mj_footer endRefreshing];
}];
}
源码 END