iOS 原生的 UIButton 点击事件是不允许带多参数的,唯一的一个参数就是默认UIButton本身
那么我们该怎么实现传递多个参数的点击事件呢?
1.如果业务场景非常简单,要求传单参数并且是整数类型,可以用tag
- [cell.deleteButton setTag:indexPath.row]; //例如,将cell的行数设置成tag
2.利用ObjC关联,runtime之所以被称为iOS 的动态特性是有道理的,当然关联甚至可以帮助NSArray等其他对象实现“多参数传递”
实现起来也非常简便:
- UIButton *btn = // create the button
- objc_setAssociatedObject(btn, "firstObject", someObject, OBJC_ASSOCIATION_RETAIN_NONATOMIC); //实际上就是KVC
- objc_setAssociatedObject(btn, "secondObject", otherObject, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
- [btn addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];
- - (void)click:(UIButton *)sender
- {
- id first = objc_getAssociatedObject(btn, "firstObject"); //取参
- id second = objc_setAssociatedObject(btn, "secondObject");
- // etc.
- }
3.利用自定义,添加一个多参数的字典属性变量即可(为什么要字典?可以装多多的)
自定义Button子类,甚至都不用重写啥的:
- @interface MultiParamButton : UIButton
- @property (nonatomic, strong) NSDictionary* multiParamDic;
- @end
- NSDictionary* paramDic = @{@"one":@"one", @"two":@2, @"third":@(3)};
- MultiParamButton* multiParamButton = [[MultiParamButton alloc] init];
- [multiParamButton setFrame:CGRectMake(0, 0, 50, 50)];
- multiParamButton.center = self.view.center;
- [multiParamButton setBackgroundColor:[UIColor grayColor]];
- [multiParamButton addTarget:self action:@selector(multiParamButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
- [self.view addSubview:multiParamButton];
- multiParamButton.multiParamDic = paramDic;
点击:
- - (void)multiParamButtonClicked:(UIButton* )button
- {
- MultiParamButton* multiParamButton = (MultiParamButton* )button;
- NSLog(@"Vvvverify : %@", multiParamButton.multiParamDic);
- }
爽爽的:
当然,如果用扩展,然后添加property后重写GetSet也是一样一样的
4.完全不在Button上入手,针对业务来,最常见的就是在TableViewCell上面的Button,这种存在(视图)继承树之间的传递,这里举个简单的例子
Button获取所属父视图的所属视图控制器的参数,间接传参
- #import "LBMultiParamButtonController.h"
- #import "MultiParamButton.h"
- @interface LBMultiParamButtonController ()
- @property (nonatomic, strong) NSDictionary* paramDic;
- @end
- @implementation LBMultiParamButtonController
- - (id)init
- {
- self = [super init];
- if (self)
- {
- _paramDic = @{@"one":@"one", @"two":@2, @"third":@(3)};
- }
- return self;
- }
- - (void)viewDidLoad
- {
- [super viewDidLoad];
- UIButton* button = [UIButton buttonWithType:UIButtonTypeCustom];
- [button setFrame:CGRectMake(0, 0, 50, 50)];
- [button setCenter:self.view.center];
- [button setBackgroundColor:[UIColor grayColor]];
- [button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
- [self.view addSubview:button];
- }
- - (void)buttonClicked:(UIButton* )button
- {
- LBMultiParamButtonController* multiParamButtonController = nil;
- //获取button所属的视图控制器,如果视图控制器都能获取,还有什么不能获取呢?
- for(UIView* next = [button superview]; next; next = next.superview)
- {
- UIResponder *nextResponder = [next nextResponder];
- if ([nextResponder isKindOfClass:[LBMultiParamButtonController class]])
- {
- multiParamButtonController = (LBMultiParamButtonController* )nextResponder;
- break;
- }
- }
- NSLog(@"param : %@", multiParamButtonController.paramDic);
- }
- @end
这种非常多的用在UITableViewCell上自定义的按钮的参数的情况!
5.利用Delegate和performSelector:withObject:withObject 方法可以传递最多两个参数:
定义protocol:
- #pragma mark - SYAccountListCellDelegate.
- @class SYAccountListCell;
- @protocol SYAccountListCellDelegate <NSObject>
- - (void)accountListCell:(SYAccountListCell* )cell didTapButton:(UIButton* )button;
- @end
自定义Cell的时候将你想传的东西传进入,这里用cell和button做例子:
- @implementation SYAccountListCell
- - (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
- {
- self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
- if (self)
- {
- self.deleteButton = [UIButton buttonWithType:UIButtonTypeCustom];
- [self.deleteButton setFrame:CGRectMake(225,
- 5,
- 40,
- 40)];
- [self.deleteButton setBackgroundColor:[UIColor redColor]];
- [self.deleteButton addTarget:self action:@selector(deleteButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
- [self.contentView addSubview:self.deleteButton];
- }
- return self;
- }
- - (void)deleteButtonClicked:(UIButton* )button
- {
- if ([self.delegate respondsToSelector:@selector(accountListCell:didTapButton:)])
- {
- [self.delegate performSelector:@selector(accountListCell:didTapButton:) withObject:self withObject:button];
- }
- }
- @end
Delegate实现:
- #pragma mark - SYAccountListCellDelegate.
- - (void)accountListCell:(SYAccountListCell *)cell didTapButton:(UIButton *)button
- {
- NSLog(@"Cell : %@ , Button : %@", cell, button);
- }
这里补充一下,这里的最多两个参数是直面的参数个数,如果将参数设置位结构体,那么就皆大欢喜啦,想怎么传就怎么传!
6.利用Block 和 关联 , 直接可以当前点击并且操作参数 - 强!
- #import <UIKit/UIKit.h>
- typedef void (^ActionBlock)();
- @interface UIButton (Utility)
- @property (readonly) NSMutableDictionary *event;
- - (void) handleControlEvent:(UIControlEvents)controlEvent withBlock:(ActionBlock)action;
- @end
实现文件:
- #import <objc/runtime.h>
- #import "UIButton+Utility.h"
- @implementation UIButton (Utility)
- static char overviewKey;
- @dynamic event;
- - (void)handleControlEvent:(UIControlEvents)event withBlock:(ActionBlock)block
- {
- objc_setAssociatedObject(self, &overviewKey, block, OBJC_ASSOCIATION_COPY_NONATOMIC);
- [self addTarget:self action:@selector(callActionBlock:) forControlEvents:event];
- }
- - (void)callActionBlock:(id)sender
- {
- ActionBlock block = (ActionBlock)objc_getAssociatedObject(self, &overviewKey);
- if (block)
- {
- block();
- }
- }
- @end
操作:
- [button handleControlEvent:UIControlEventTouchUpInside withBlock:^{
- NSLog(@"ssss : %@", self.paramDic);
- }];