IOS疯狂基础之UIButton

有些时候我们想让UIButton的title居左对齐，我们设置

btn.textLabel.textAlignment = UITextAlignmentLeft

是没有作用的，我们需要设置

btn.contentHorizontalAlignment = UIControlContentHorizonAlignmentLeft;

但是问题又出来，此时文字会紧贴到做边框，我们可以设置

btn.contentEdgeInsets = UIEdgeInsetsMake(0,10, 0, 0);

使文字距离做边框保持10个像素的距离。

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设置UIButton上字体的颜色设置UIButton上字体的颜色，不是用：

[btn.titleLabel setTextColor:[UIColorblackColor]];

btn.titleLabel.textColor=[UIColor redColor];

而是用：

[btn setTitleColor:[UIColor blackColor]forState:UIControlStateNormal];

    UIButton *btn = [UIButtonbuttonWithType:UIButtonTypeRoundedRect];

    [btn addTarget:selfaction:@selector(buttonDown:)forControlEvents:UIControlEventTouchDown];//设置事件有冒号的方法带参数

    [btn addTarget:selfaction:@selector(btnUp)forControlEvents:UIControlEventTouchUpInside];

    [btn setTitle:@"这就去拿" forState:UIControlStateNormal];//设置标题

    [btn setTitleColor:[UIColorwhiteColor]forState:UIControlStateNormal];

    [btn setTitleColor:[UIColorwhiteColor]forState:UIControlEventTouchDown];

    btn.frame = CGRectMake(80.0,210.0,160.0, 40.0);//大小位置

    [btn setBackgroundImage:[UIImageimageNamed:@"btn1.jpg"]forState:UIControlStateNormal];//设置背景图片

    [btn setBackgroundImage:[UIImageimageNamed:@"btn2.jpg"]forState:UIControlEventTouchDown];//设置按下去时的图片

#import <QuartzCore/QuartzCore.h>

 //设置登录按钮边框

   loginBtn.tag =2;

   CALayer * downButtonLayer = [loginBtnlayer];

    [downButtonLayersetMasksToBounds:YES];

    [downButtonLayersetCornerRadius:10.0];

    [downButtonLayersetBorderWidth:1.0];

    [downButtonLayer setBorderColor:[[UIColorcolorWithRed:7/255.0green:98/255.0blue:182/255.0alpha:1]CGColor]];

    [self.viewinsertSubview:loginBtnatIndex:loginBtn.tag];

待续。。。

-(void)buttonDown:(id)sender{

    //UIButton* btn = (UIButton*)sender;

    NSLog(@"Button pushed down");

}

-(void)btnUp{

    NSLog(@"btn is up");

}

其他：

UIButton状态:

UIControlStateNormal          // 正常状态   

UIControlStateHighlighted     // 高亮状态   

UIControlStateDisabled        // 禁用状态    

UIControlStateSelected        // 选中状态    

UIControlStateApplication     //     

UIControlStateReserved        // 保留状态

UIButton类型:

UIButtonTypeCustom            //自定义类型

添加图片：  灰色背景颜色：

UIButtonTypeRoundedRect       //圆角类型

UIButtonTypeDetailDisclosure   //细节展示按钮

UIButtonTypeInfoLight          //浅色背景的信息按钮

UIButtonTypeInfoDark           //暗色背景的信息按钮

UIButtonTypeContactAdd         // 添加按钮