iPhone开发入门5 － iphone Programming - UIButton Action

最新推荐文章于 2025-08-12 17:54:22 发布

dotphoenix

最新推荐文章于 2025-08-12 17:54:22 发布

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分类专栏： MAC&amp;iPhone开发文章标签： iphone uiview button action image

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本文介绍如何使用Objective-C为UIButton设置点击事件，通过addTarget方法指定响应的方法，并展示了一个简单的示例，当按钮被点击时，会在屏幕中央显示一条消息。

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iphone Programming - UIButton Action

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UIButton *myButton= [[UIButton buttonWithType:UIButtonTypeRoundedRect] retain];
myButton.frame = CGRectMake(105,180, 115, 35);
[myButton setTitle:@"Apply Image" forState:UIControlStateNormal];
myButton.backgroundColor = [UIColor clearColor];
[myButton addTarget:self action:@selector(ApplyImage: )forControlEvents:UIControlEventTouchUpInside];

-(void)ApplyImage:(id)sender
{
UIView *mview= [[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];

UILabel *name = [[UILabel alloc]initWithFrame:CGRectMake(105,180,250,25)];
name.text = @”Button Clicked !…..”;
name.textColor=[UIColor whiteColor];
name.font=[UIFont boldSystemFontOfSize:13];
name.backgroundColor=[UIColor clearColor];
[mview addSubview:name];
[name release];

[window addSubview:mview];
[mview release];
}

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The pink color line is main to perform the button action.

action:@selector(ApplyImage: ) –>Calling method name

addTarget:self—> the calling method is in the same class

Means we are calling ApplyImage() method on button click , which the method in the same class.

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