编程

iOS 学习（一） 绑定事件

学习事件绑定方法。

直接对按钮组件进行绑定

在 Main.storyboard 中，拖拽组件到 implementation 中。唯一问题就是必须是可点击组件，其他组件不支持。

直接代码绑定触摸

使用 UITapGestureRecognizer 处理。也要注意，组件 userInteractionEnabled 需要是 YES。

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#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController


- (void)viewDidLoad {
    [super viewDidLoad];
    [self setupView];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

- (void)setupView {
    UIView *view = [[UIView alloc] init];
    view.frame = CGRectMake(0, 20, 200, 50);
    view.backgroundColor = [UIColor lightGrayColor];
    [self.view addSubview:view];

    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(10, 10, 100, 20)];
    [label setText:@"tap here"];
    [label setTextColor:[UIColor whiteColor]];
    [view addSubview:label];

    label.userInteractionEnabled = YES;
    UITapGestureRecognizer *labelTapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(labelTouchUpInside:)];
    [label addGestureRecognizer:labelTapGestureRecognizer];
}

- (void)labelTouchUpInside:(UITapGestureRecognizer *)recognizer {
    NSLog(@"tap label,text(%@)", ((UILabel *) recognizer.view).text);
}

- (IBAction)buttonTouchUpInside:(id)sender {
    NSLog(@"tap button");
}

@end