记录下UIButton的图文妙用和子控件的优先显示

　　UIButton的用处特别多，这里只记录下把按钮应用在图文显示的场景，和需要把图片作为按钮的背景图片显示场景；

另外记录下在父控件的子控件优先显示方法（控件置于最前面和置于最后面）。

先上效果图：

1、当在某个地方既需要显示图片，还需要显示文字，另外还要有点击功能的时候，这时按钮是个很好的选择。

　　按钮中的图片和文字的距离可以自由调整，图片的也可以上下左右翻转。日常项目中像这些场景都是很容易碰到的。

　　按钮图文设置、图文位置移动、按钮中图片翻转示例代码：

/** 测试图文并茂的按钮，图文移动 */
- (void)addMoveImgAndTextButton{//1、创建一个按钮：30x50UIButton *iconBtn = [[UIButton alloc] initWithFrame:CGRectMake(10, 100, 150, 80)];[iconBtn setTitle:@"我的好友" forState:UIControlStateNormal];[iconBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];[iconBtn setImage:[UIImage imageNamed:@"pointer"] forState:UIControlStateNormal];iconBtn.layer.borderColor = [UIColor redColor].CGColor;  //边框颜色iconBtn.layer.borderWidth = 1;  //边框宽度iconBtn.titleLabel.backgroundColor = [UIColor greenColor]; //文字颜色iconBtn.imageView.backgroundColor = [UIColor blackColor]; //图片颜色
    [iconBtn addTarget:self action:@selector(clickButton:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:iconBtn];self.iconBtn = iconBtn;//2、移动iconBtn按钮图片和文字UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(170, 100, 120, 45)];[btn setTitle:@"图右移字左移" forState:UIControlStateNormal];btn.titleLabel.numberOfLines = 0;[btn setBackgroundColor:[UIColor blackColor]];[btn addTarget:self action:@selector(changeBtnFrame:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:btn];//3、移动iconBtn按钮图片和文字UIButton *btn2 = [[UIButton alloc] initWithFrame:CGRectMake(170, 150, 120, 45)];[btn2 setTitle:@"字右移图左移" forState:UIControlStateNormal];btn2.titleLabel.numberOfLines = 0;[btn2 setBackgroundColor:[UIColor blackColor]];[btn2 addTarget:self action:@selector(changeBtnFrame2:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:btn2];//分割线UIView *lineView = [[UIView alloc] initWithFrame:CGRectMake(0, 210, 500, 1)];lineView.backgroundColor = [UIColor grayColor];[self.view addSubview:lineView];
}/** 点击按钮使图片位置翻转 */
- (void)clickButton:(UIButton *)sender{sender.imageView.transform = CGAffineTransformRotate(sender.imageView.transform, M_PI);
}/** 移动图片和文字位置 */
- (void)changeBtnFrame:(UIButton *)sender{UIEdgeInsets edge = self.iconBtn.imageEdgeInsets;CGFloat changeNum = 10;self.iconBtn.imageEdgeInsets = UIEdgeInsetsMake(0, edge.left + changeNum, 0, -(edge.left + changeNum));self.iconBtn.titleEdgeInsets = UIEdgeInsetsMake(0, -(edge.left + changeNum), 0, edge.left + changeNum);NSLog(@"edge.left: %f, edge.right: %f", edge.left, edge.right);
}/** 反方向移动图片和文字位置 */
- (void)changeBtnFrame2:(UIButton *)sender{UIEdgeInsets edge = self.iconBtn.imageEdgeInsets;CGFloat changeNum = 10;self.iconBtn.imageEdgeInsets = UIEdgeInsetsMake(0, edge.left - changeNum, 0, -(edge.left - changeNum));self.iconBtn.titleEdgeInsets = UIEdgeInsetsMake(0, -(edge.left - changeNum), 0, edge.left - changeNum);NSLog(@"...edge.left: %f, edge.right: %f", edge.left, edge.right);
}

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2、有时候需要给按钮设置背景图片，一般UI给个图片，然后我们自己对图片进行处理，让背景图片自适应按钮展示，矩形圆角。

　　但是有时候，产品要求显示的按钮左右必须是圆形的，这时候虽然可以让ui切个适配的图片做背景，其实针对如果是背景图片是纯色的话，我们可以利用

控件的layer.masksToBounds，和layer.cornerRadius属性来让按钮或者其他控件左右两边都是圆形的。

下面写了五个橙色背景的按钮作比较：背景图片和按钮尺寸匹配的、背景图片和按钮尺寸或偏大或偏小的、处理背景图片让背景图片自适应按钮的、不用背景图片使用图层来设置按钮左右圆形的：

/** 测试给按钮设置背景图片 */
- (void)addBackgroundImgButton{//4、96x25 按钮设置背景图片，颜色rgb(255,145,0)UIImage *img = [UIImage imageNamed:@"btn_bg"];UIButton *clickBtn = [[UIButton alloc] initWithFrame:CGRectMake(10, 240, 96, 25)];[clickBtn setBackgroundImage:img forState:UIControlStateNormal];[clickBtn setTitle:@"click Me" forState:UIControlStateNormal];[self.view addSubview:clickBtn];//4.2 给按钮设置背景图片, 按钮图片不适配UIButton *clickBtn2 = [[UIButton alloc] initWithFrame:CGRectMake(120, 220, 120, 50)];[clickBtn2 setBackgroundImage:img forState:UIControlStateNormal];[clickBtn2 setTitle:@"click Me" forState:UIControlStateNormal];[self.view addSubview:clickBtn2];//4.3 给按钮设置背景图片，按钮和图片不适配UIButton *clickBtn3 = [[UIButton alloc] initWithFrame:CGRectMake(260, 240, 80, 15)];[clickBtn3 setBackgroundImage:img forState:UIControlStateNormal];[clickBtn3 setTitle:@"click Me" forState:UIControlStateNormal];[self.view addSubview:clickBtn3];//4.4 处理背景图片，让背景图片自适应按钮NSLog(@"img.size: %@", NSStringFromCGSize(img.size));UIImage *newImg = [img stretchableImageWithLeftCapWidth:img.size.width/2 topCapHeight:img.size.height/2];NSLog(@"newImg.size: %@", NSStringFromCGSize(newImg.size));UIButton *clickBtn4 = [[UIButton alloc] initWithFrame:CGRectMake(10, 300, 150, 60)];[clickBtn4 setBackgroundImage:newImg forState:UIControlStateNormal];[clickBtn4 setTitle:@"click Me" forState:UIControlStateNormal];[self.view addSubview:clickBtn4];//4.5 按钮不使用背景图片，设置背景颜色当做有背景图片UIButton *clickBtn5 = [[UIButton alloc] initWithFrame:CGRectMake(180, 300, 150, 60)];[clickBtn5 setTitle:@"click Me" forState:UIControlStateNormal];clickBtn5.layer.masksToBounds = YES;clickBtn5.layer.cornerRadius = 30;clickBtn5.backgroundColor = [UIColor colorWithRed:255/255.f green:145/255.f blue:0 alpha:1];[self.view addSubview:clickBtn5];//分割线UIView *lineView = [[UIView alloc] initWithFrame:CGRectMake(0, 380, 500, 1)];lineView.backgroundColor = [UIColor grayColor];[self.view addSubview:lineView];
}

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3、在有些场景下，需要控制控件的优先显示或者置后显示，需要用到方法

- (void)bringSubviewToFront:(UIView *)view; // 将子控件view显示在父控件的所有子控件的最前面

- (void)sendSubviewToBack:(UIView *)view; //将子控件view显示在父控件的所有子控件的最后面

示例代码：

/** 测试子控件的优先显示（置前和置后） */
- (void)testSubControlShowFront{//1、红色viewUIView *redView = [[UIView alloc] initWithFrame:CGRectMake(10, 420, 200, 200)];redView.backgroundColor = [UIColor redColor];redView.tag = 11;[self.view addSubview:redView];//2、黑色viewUIView *blackView = [[UIView alloc] initWithFrame:CGRectMake(30, 400, 200, 200)];blackView.backgroundColor = [UIColor blackColor];blackView.tag = 12;[self.view addSubview:blackView];//3、紫色viewUIView *purpleView = [[UIView alloc] initWithFrame:CGRectMake(50, 440, 200, 200)];purpleView.backgroundColor = [UIColor purpleColor];purpleView.tag = 13;[self.view addSubview:purpleView];//添加操作按钮UIButton *operatorBtn = [[UIButton alloc] initWithFrame:CGRectMake(280, 400, 100, 30)];[operatorBtn setTitle:@"红色置前" forState:UIControlStateNormal];operatorBtn.tag = 1;operatorBtn.backgroundColor = [UIColor blackColor];[operatorBtn addTarget:self action:@selector(changeViewToFrontShow:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:operatorBtn];UIButton *operatorBtn2 = [[UIButton alloc] initWithFrame:CGRectMake(280, 450, 100, 30)];[operatorBtn2 setTitle:@"黑色置前" forState:UIControlStateNormal];operatorBtn2.tag = 2;operatorBtn2.backgroundColor = [UIColor blackColor];[operatorBtn2 addTarget:self action:@selector(changeViewToFrontShow:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:operatorBtn2];UIButton *operatorBtn3 = [[UIButton alloc] initWithFrame:CGRectMake(280, 500, 100, 30)];[operatorBtn3 setTitle:@"紫色置前" forState:UIControlStateNormal];operatorBtn3.tag = 3;operatorBtn3.backgroundColor = [UIColor blackColor];[operatorBtn3 addTarget:self action:@selector(changeViewToFrontShow:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:operatorBtn3];UIButton *operatorBtn4 = [[UIButton alloc] initWithFrame:CGRectMake(280, 550, 100, 30)];[operatorBtn4 setTitle:@"紫色置后" forState:UIControlStateNormal];operatorBtn4.tag = 4;operatorBtn4.backgroundColor = [UIColor redColor];[operatorBtn4 addTarget:self action:@selector(changeViewToFrontShow:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:operatorBtn4];
}
/** 操作按钮，切换view置前显示 */
- (void)changeViewToFrontShow:(UIButton *)sender{if (sender.tag == 1){//红色置前UIView *redView = [self.view viewWithTag:11];//将子控件redView在父控件view的所有子控件的最前面显示
        [self.view bringSubviewToFront:redView];}else if (sender.tag == 2){//黑色置前UIView *blackView = [self.view viewWithTag:12]; //获取黑色子控件//将子控件blackView在父控件view的所有子控件的最前面显示
        [self.view bringSubviewToFront:blackView];}else if (sender.tag == 3){//紫色置前UIView *purpleView = [self.view viewWithTag:13]; //获取紫色子控件//将子控件purpleView在父控件view的所有子控件的最前面显示
        [self.view bringSubviewToFront:purpleView];}else if (sender.tag == 4){//紫色置后UIView *purpleView = [self.view viewWithTag:13]; //获取紫色子控件//将子控件purpleView在父控件view的所有子控件的最后面显示
        [self.view sendSubviewToBack:purpleView];}
}

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------------------------------------------------------------------------------

----- 完整代码 ------

//
//  TestButtonVC.m
//  tan_iosTwo
//
//  Created by PX_Mac on 16/10/16.
//
//

#import "TestButtonVC.h"@interface TestButtonVC ()@property (nonatomic, weak) UIButton *iconBtn; //带文字和图片的按钮@end@implementation TestButtonVC- (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view.
    [self addMoveImgAndTextButton]; //添加图文并茂的按钮，测试按钮上的图文移动
    [self addBackgroundImgButton]; //添加设置背景图片的按钮
    [self testSubControlShowFront]; //测试子控件的优先或置后显示
}/** 测试图文并茂的按钮，图文移动 */
- (void)addMoveImgAndTextButton{//1、创建一个按钮：30x50UIButton *iconBtn = [[UIButton alloc] initWithFrame:CGRectMake(10, 100, 150, 80)];[iconBtn setTitle:@"我的好友" forState:UIControlStateNormal];[iconBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];[iconBtn setImage:[UIImage imageNamed:@"pointer"] forState:UIControlStateNormal];iconBtn.layer.borderColor = [UIColor redColor].CGColor;  //边框颜色iconBtn.layer.borderWidth = 1;  //边框宽度iconBtn.titleLabel.backgroundColor = [UIColor greenColor]; //文字颜色iconBtn.imageView.backgroundColor = [UIColor blackColor]; //图片颜色
    [iconBtn addTarget:self action:@selector(clickButton:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:iconBtn];self.iconBtn = iconBtn;//2、移动iconBtn按钮图片和文字UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(170, 100, 120, 45)];[btn setTitle:@"图右移字左移" forState:UIControlStateNormal];btn.titleLabel.numberOfLines = 0;[btn setBackgroundColor:[UIColor blackColor]];[btn addTarget:self action:@selector(changeBtnFrame:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:btn];//3、移动iconBtn按钮图片和文字UIButton *btn2 = [[UIButton alloc] initWithFrame:CGRectMake(170, 150, 120, 45)];[btn2 setTitle:@"字右移图左移" forState:UIControlStateNormal];btn2.titleLabel.numberOfLines = 0;[btn2 setBackgroundColor:[UIColor blackColor]];[btn2 addTarget:self action:@selector(changeBtnFrame2:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:btn2];//分割线UIView *lineView = [[UIView alloc] initWithFrame:CGRectMake(0, 210, 500, 1)];lineView.backgroundColor = [UIColor grayColor];[self.view addSubview:lineView];
}/** 点击按钮使图片位置翻转 */
- (void)clickButton:(UIButton *)sender{sender.imageView.transform = CGAffineTransformRotate(sender.imageView.transform, M_PI);
}/** 移动图片和文字位置 */
- (void)changeBtnFrame:(UIButton *)sender{UIEdgeInsets edge = self.iconBtn.imageEdgeInsets;CGFloat changeNum = 10;self.iconBtn.imageEdgeInsets = UIEdgeInsetsMake(0, edge.left + changeNum, 0, -(edge.left + changeNum));self.iconBtn.titleEdgeInsets = UIEdgeInsetsMake(0, -(edge.left + changeNum), 0, edge.left + changeNum);NSLog(@"edge.left: %f, edge.right: %f", edge.left, edge.right);
}/** 反方向移动图片和文字位置 */
- (void)changeBtnFrame2:(UIButton *)sender{UIEdgeInsets edge = self.iconBtn.imageEdgeInsets;CGFloat changeNum = 10;self.iconBtn.imageEdgeInsets = UIEdgeInsetsMake(0, edge.left - changeNum, 0, -(edge.left - changeNum));self.iconBtn.titleEdgeInsets = UIEdgeInsetsMake(0, -(edge.left - changeNum), 0, edge.left - changeNum);NSLog(@"...edge.left: %f, edge.right: %f", edge.left, edge.right);
}/** 测试给按钮设置背景图片 */
- (void)addBackgroundImgButton{//4、96x25 按钮设置背景图片，颜色rgb(255,145,0)UIImage *img = [UIImage imageNamed:@"btn_bg"];UIButton *clickBtn = [[UIButton alloc] initWithFrame:CGRectMake(10, 240, 96, 25)];[clickBtn setBackgroundImage:img forState:UIControlStateNormal];[clickBtn setTitle:@"click Me" forState:UIControlStateNormal];[self.view addSubview:clickBtn];//4.2 给按钮设置背景图片, 按钮图片不适配UIButton *clickBtn2 = [[UIButton alloc] initWithFrame:CGRectMake(120, 220, 120, 50)];[clickBtn2 setBackgroundImage:img forState:UIControlStateNormal];[clickBtn2 setTitle:@"click Me" forState:UIControlStateNormal];[self.view addSubview:clickBtn2];//4.3 给按钮设置背景图片，按钮和图片不适配UIButton *clickBtn3 = [[UIButton alloc] initWithFrame:CGRectMake(260, 240, 80, 15)];[clickBtn3 setBackgroundImage:img forState:UIControlStateNormal];[clickBtn3 setTitle:@"click Me" forState:UIControlStateNormal];[self.view addSubview:clickBtn3];//4.4 处理背景图片，让背景图片自适应按钮NSLog(@"img.size: %@", NSStringFromCGSize(img.size));UIImage *newImg = [img stretchableImageWithLeftCapWidth:img.size.width/2 topCapHeight:img.size.height/2];NSLog(@"newImg.size: %@", NSStringFromCGSize(newImg.size));UIButton *clickBtn4 = [[UIButton alloc] initWithFrame:CGRectMake(10, 300, 150, 60)];[clickBtn4 setBackgroundImage:newImg forState:UIControlStateNormal];[clickBtn4 setTitle:@"click Me" forState:UIControlStateNormal];[self.view addSubview:clickBtn4];//4.5 按钮不使用背景图片，设置背景颜色当做有背景图片UIButton *clickBtn5 = [[UIButton alloc] initWithFrame:CGRectMake(180, 300, 150, 60)];[clickBtn5 setTitle:@"click Me" forState:UIControlStateNormal];clickBtn5.layer.masksToBounds = YES;clickBtn5.layer.cornerRadius = 30;clickBtn5.backgroundColor = [UIColor colorWithRed:255/255.f green:145/255.f blue:0 alpha:1];[self.view addSubview:clickBtn5];//分割线UIView *lineView = [[UIView alloc] initWithFrame:CGRectMake(0, 380, 500, 1)];lineView.backgroundColor = [UIColor grayColor];[self.view addSubview:lineView];
}/** 测试子控件的优先显示（置前和置后） */
- (void)testSubControlShowFront{//1、红色viewUIView *redView = [[UIView alloc] initWithFrame:CGRectMake(10, 420, 200, 200)];redView.backgroundColor = [UIColor redColor];redView.tag = 11;[self.view addSubview:redView];//2、黑色viewUIView *blackView = [[UIView alloc] initWithFrame:CGRectMake(30, 400, 200, 200)];blackView.backgroundColor = [UIColor blackColor];blackView.tag = 12;[self.view addSubview:blackView];//3、紫色viewUIView *purpleView = [[UIView alloc] initWithFrame:CGRectMake(50, 440, 200, 200)];purpleView.backgroundColor = [UIColor purpleColor];purpleView.tag = 13;[self.view addSubview:purpleView];//添加操作按钮UIButton *operatorBtn = [[UIButton alloc] initWithFrame:CGRectMake(280, 400, 100, 30)];[operatorBtn setTitle:@"红色置前" forState:UIControlStateNormal];operatorBtn.tag = 1;operatorBtn.backgroundColor = [UIColor blackColor];[operatorBtn addTarget:self action:@selector(changeViewToFrontShow:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:operatorBtn];UIButton *operatorBtn2 = [[UIButton alloc] initWithFrame:CGRectMake(280, 450, 100, 30)];[operatorBtn2 setTitle:@"黑色置前" forState:UIControlStateNormal];operatorBtn2.tag = 2;operatorBtn2.backgroundColor = [UIColor blackColor];[operatorBtn2 addTarget:self action:@selector(changeViewToFrontShow:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:operatorBtn2];UIButton *operatorBtn3 = [[UIButton alloc] initWithFrame:CGRectMake(280, 500, 100, 30)];[operatorBtn3 setTitle:@"紫色置前" forState:UIControlStateNormal];operatorBtn3.tag = 3;operatorBtn3.backgroundColor = [UIColor blackColor];[operatorBtn3 addTarget:self action:@selector(changeViewToFrontShow:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:operatorBtn3];UIButton *operatorBtn4 = [[UIButton alloc] initWithFrame:CGRectMake(280, 550, 100, 30)];[operatorBtn4 setTitle:@"紫色置后" forState:UIControlStateNormal];operatorBtn4.tag = 4;operatorBtn4.backgroundColor = [UIColor redColor];[operatorBtn4 addTarget:self action:@selector(changeViewToFrontShow:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:operatorBtn4];
}
/** 操作按钮，切换view置前显示 */
- (void)changeViewToFrontShow:(UIButton *)sender{if (sender.tag == 1){//红色置前UIView *redView = [self.view viewWithTag:11];//将子控件redView在父控件view的所有子控件的最前面显示
        [self.view bringSubviewToFront:redView];}else if (sender.tag == 2){//黑色置前UIView *blackView = [self.view viewWithTag:12]; //获取黑色子控件//将子控件blackView在父控件view的所有子控件的最前面显示
        [self.view bringSubviewToFront:blackView];}else if (sender.tag == 3){//紫色置前UIView *purpleView = [self.view viewWithTag:13]; //获取紫色子控件//将子控件purpleView在父控件view的所有子控件的最前面显示
        [self.view bringSubviewToFront:purpleView];}else if (sender.tag == 4){//紫色置后UIView *purpleView = [self.view viewWithTag:13]; //获取紫色子控件//将子控件purpleView在父控件view的所有子控件的最后面显示
        [self.view sendSubviewToBack:purpleView];}
}- (void)didReceiveMemoryWarning {[super didReceiveMemoryWarning];// Dispose of any resources that can be recreated.
}/*
#pragma mark - Navigation// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {// Get the new view controller using [segue destinationViewController].// Pass the selected object to the new view controller.
}
*/@end

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作者：xmTan
出处：http://www.cnblogs.com/tandaxia/
欢迎转载，但要在文章页面明显位置给出原文链接，否则保留追究法律责任的权利。
欢迎指出博客中的错误。以免更多的人被误导。

转载于:https://www.cnblogs.com/tandaxia/p/5975729.html

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