编程技巧 - Button多参数点击
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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 buttonobjc_setAssociatedObject(btn, "firstObject", someObject, OBJC_ASSOCIATION_RETAIN_NONATOMIC); //实际上就是KVCobjc_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); }];
转别人的,超强耶!
目前就这6种比较容易实现的传参方式,写这个其实最重要的不是实现的效果,而是我在网上搜集资料的时候看到很多人说,系统不支持,所以不可行,甚至连关联那么简单的都不试试,学技术的态度就是应该直接地,间接地,不断去尝试,才能有收获!!
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