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iOS UIButton 点击事件带多参数

iOS UIButton 点击事件带多参数

作者: 疾风知劲草_erudite | 来源:发表于2017-02-03 16:06 被阅读2405次

    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.deleteButtonsetTag: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);

    [btnaddTarget:selfaction:@selector(click:)forControlEvents:UIControlEventTouchUpInside];

    - (void)click:(UIButton*)sender

    {

    idfirst = objc_getAssociatedObject(btn,"firstObject");//取参

    idsecond = 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:

    @interfaceMultiParamButton : UIButton

    @property(nonatomic,strong) NSDictionary* multiParamDic;

    @end

    传参:

    NSDictionary* paramDic = @{@"one":@"one",@"two":@2,@"third":@(3)};

    MultiParamButton* multiParamButton = [[MultiParamButtonalloc]init];

    [multiParamButtonsetFrame:CGRectMake(0,0,50,50)];

    multiParamButton.center=self.view.center;

    [multiParamButtonsetBackgroundColor:[UIColorgrayColor]];

    [multiParamButtonaddTarget:selfaction:@selector(multiParamButtonClicked:)forControlEvents:UIControlEventTouchUpInside];

    [self.viewaddSubview:multiParamButton];

    multiParamButton.multiParamDic= paramDic;

    点击:

    - (void)multiParamButtonClicked:(UIButton* )button

    {

    MultiParamButton* multiParamButton = (MultiParamButton* )button;

    NSLog(@"Vvvverify : %@", multiParamButton.multiParamDic);

    }

    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"

    @interfaceLBMultiParamButtonController ()

    @property(nonatomic,strong) NSDictionary* paramDic;

    @end

    @implementationLBMultiParamButtonController

    - (id)init

    {

    self= [superinit];

    if(self)

    {

    _paramDic = @{@"one":@"one",@"two":@2,@"third":@(3)};

    }

    returnself;

    }

    - (void)viewDidLoad

    {

    [superviewDidLoad];

    UIButton* button = [UIButtonbuttonWithType:UIButtonTypeCustom];

    [buttonsetFrame:CGRectMake(0,0,50,50)];

    [buttonsetCenter:self.view.center];

    [buttonsetBackgroundColor:[UIColorgrayColor]];

    [buttonaddTarget:selfaction:@selector(buttonClicked:)forControlEvents:UIControlEventTouchUpInside];

    [self.viewaddSubview: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 = [buttonsuperview]; next; next = next.superview)

    {

    UIResponder*nextResponder = [nextnextResponder];

    if([nextResponderisKindOfClass:[LBMultiParamButtonControllerclass]])

    {

    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.

    @classSYAccountListCell;

    @protocolSYAccountListCellDelegate 

    - (void)accountListCell:(SYAccountListCell* )celldidTapButton:(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:

    @implementationSYAccountListCell

    - (id)initWithStyle:(UITableViewCellStyle)stylereuseIdentifier:(NSString*)reuseIdentifier

    {

    self= [superinitWithStyle:stylereuseIdentifier:reuseIdentifier];

    if(self)

    {

    self.deleteButton= [UIButtonbuttonWithType:UIButtonTypeCustom];

    [self.deleteButtonsetFrame:CGRectMake(225,

    5,

    40,

    40)];

    [self.deleteButtonsetBackgroundColor:[UIColorredColor]];

    [self.deleteButtonaddTarget:selfaction:@selector(deleteButtonClicked:)forControlEvents:UIControlEventTouchUpInside];

    [self.contentViewaddSubview:self.deleteButton];

    }

    returnself;

    }

    - (void)deleteButtonClicked:(UIButton* )button

    {

    if([self.delegaterespondsToSelector:@selector(accountListCell:didTapButton:)])

    {

    [self.delegateperformSelector:@selector(accountListCell:didTapButton:)withObject:selfwithObject:button];

    }

    }

    @end

    Delegate实现:

    #pragma mark - SYAccountListCellDelegate.

    - (void)accountListCell:(SYAccountListCell*)celldidTapButton:(UIButton*)button

    {

    NSLog(@"Cell : %@ , Button : %@", cell, button);

    }

    虽然有点曲折,但是传参效果非常到位

    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 

    typedefvoid(^ActionBlock)();

    @interfaceUIButton (Utility)

    @property(readonly)NSMutableDictionary*event;

    - (void)handleControlEvent:(UIControlEvents)controlEventwithBlock:(ActionBlock)action;

    @end

    实现文件:

    #import 

    #import "UIButton+Utility.h"

    @implementationUIButton (Utility)

    staticcharoverviewKey;

    @dynamicevent;

    - (void)handleControlEvent:(UIControlEvents)eventwithBlock:(ActionBlock)block

    {

    objc_setAssociatedObject(self, &overviewKey, block, OBJC_ASSOCIATION_COPY_NONATOMIC);

    [selfaddTarget:selfaction:@selector(callActionBlock:)forControlEvents:event];

    }

    - (void)callActionBlock:(id)sender

    {

    ActionBlock block = (ActionBlock)objc_getAssociatedObject(self, &overviewKey);

    if(block)

    {

    block();

    }

    }

    @end

    操作:

    [buttonhandleControlEvent:UIControlEventTouchUpInsidewithBlock:^{

    NSLog(@"ssss : %@",self.paramDic);

    }];

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