UIButton内部子控件自定义布局-“UIEdgeInsets”

UIButton

UIButton做frame动画时,不响应点击

  • 在一个View内部加入几个按钮,然后改变这个view的frame来做动画,但是按钮不响应点击事件。

  • 问题代码

    __block CGRect rect = _scrollView.frame;
CGFloat width = [UIScreen mainScreen].bounds.size.width;
[UIView setAnimationsEnabled:YES];
[UIView animateWithDuration:0.3f animations:^{
rect.origin.x -= 10;
if (rect.origin.x <= - width) {
// 添加下一个scrollView到self
[UIView setAnimationsEnabled:NO];
rect.origin.x = width + 10; }
_scrollView.frame = rect;
} completion:^(BOOL finished) { }];
  • 解决问题
    [UIView animateWithDuration:0.3f delay:0 options:UIViewAnimationOptionAllowUserInteraction animations:^{
rect.origin.x -= 10;
if (rect.origin.x <= - width) {
// 添加下一个scrollView到self
[UIView setAnimationsEnabled:NO];
rect.origin.x = width + 10;
}
_scrollView.frame = rect;
} completion:^(BOOL finished) { }];
  • 结论

    - 应该是在改变一个控件的frame做动画时,控件的交互被关闭了,所以要在做动画时改变方法,手动开启交互。

UIButton 内部布局变化

  • 控件竖排

UIButton内部子控件自定义布局-“UIEdgeInsets”

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
_focusBtn = [UIButton buttonWithType:UIButtonTypeCustom];
_focusBtn.frame = CGRectMake(10, 100, 52, 52);
_focusBtn.backgroundColor = [UIColor greenColor];
[_focusBtn setTitle:@"关注" forState:UIControlStateNormal]; CGFloat buttonWidth = 52;
CGFloat textWidth = 30;
CGFloat imageWidth = 19;
[_focusBtn setImage:[UIImage imageNamed:@"focusBtn"] forState:UIControlStateNormal];
[_focusBtn setBackgroundImage:[UIImage imageNamed:@"redcolor"] forState:UIControlStateNormal];
[_focusBtn setContentHorizontalAlignment:UIControlContentHorizontalAlignmentLeft];
[_focusBtn setContentVerticalAlignment:UIControlContentVerticalAlignmentTop]; [_focusBtn setImageEdgeInsets:UIEdgeInsetsMake(6,(52-20)/2, 0, _focusBtn.titleLabel.bounds.size.width )];
[_focusBtn setTitleEdgeInsets:UIEdgeInsetsMake(17.5 + 6 , - ([_focusBtn currentImage].size.width) + 7 , 9,0 )]; [self.view addSubview:_focusBtn]; }

UIButton 默认布局

  • 默认布局是横排:图片在左,label在右,并且居中方式是水平居中对齐,垂直居中对齐。
    • UIButton内部子控件自定义布局-“UIEdgeInsets”
    • 紫色是image的frame,绿色是label的frame,黄色是button的frame
    • 如果要改变为竖排,那么首先要把对齐方式改为水平靠左,垂直靠上。
    • UIButton内部子控件自定义布局-“UIEdgeInsets”
    • 然后再设置每个子控件的UIEdgeInsets
    • 最终展示效果是这样的
    • UIButton内部子控件自定义布局-“UIEdgeInsets”
    • 中间过渡过程是这样的
    • UIButton内部子控件自定义布局-“UIEdgeInsets”
    • 由此图可见,image要的left要右移,也就是增大正数,但是label的left要左移,也就是要减小为负数。
    • 这里总结一下,UIEdgeInsets的top,left,bottom,right属性,分别表示处于父控件的内部边距,如left,为正数,表示右移多少,为负数,表示左移多少。
    [_focusBtn setContentHorizontalAlignment:UIControlContentHorizontalAlignmentLeft];
[_focusBtn setContentVerticalAlignment:UIControlContentVerticalAlignmentTop];
  • 注:在iOS中,UIEdgeInsets跟web中的padding一样的分top,left,bottom和right,正数就表示与周围的距离变大,例如:默认在是0,我把top变成了10,这时该元素与顶端的距离就会增加10,即元素下移,距离变大。如果是负数的话效果就相反了,距离拉近。
     [_focusBtn setImageEdgeInsets:UIEdgeInsetsMake(6,(52-20)/2, 0, _focusBtn.titleLabel.bounds.size.width )];
[_focusBtn setTitleEdgeInsets:UIEdgeInsetsMake(17.5 + 6 , - ([_focusBtn currentImage].size.width) + 7 , 9,0 )];
  • 这样的效果就是
    • UIButton内部子控件自定义布局-“UIEdgeInsets”

label居中问题

  • 下午计算文字的宽度的时候一直出问题,主要是根据文字宽度计算内边距,但是文字长度不等,对这个布局有很大影响。
  • UIButton内部子控件自定义布局-“UIEdgeInsets”
  • UIButton内部子控件自定义布局-“UIEdgeInsets”
  • UIButton内部子控件自定义布局-“UIEdgeInsets”
- (void)focusedBtn:(NSInteger)number
{
_focusedBtn = [[UIButton alloc] initWithFrame:CGRectMake(0, 100, 52, 52)];
NSString *title = @"";
if (number >= 10000)
{
title = [NSString stringWithFormat:@"%.1f万",number/10000.0];
}
else
{
title = [NSString stringWithFormat:@"%zd",number]; } [_focusedBtn setTitle:title forState:UIControlStateNormal]; UILabel *lab = [[UILabel alloc] init];
lab.text = @"1";
lab.font = [UIFont systemFontOfSize:12]; // font 12 : label.width 7
[lab sizeToFit];
NSLog(@"%@",NSStringFromCGSize(lab.bounds.size)); NSLog(@"buttuon:%@",NSStringFromCGRect(_focusedBtn.frame));
NSLog(@"imageView:%@",NSStringFromCGRect(_focusedBtn.imageView.frame));
NSLog(@"textLabel:%@",NSStringFromCGRect(_focusedBtn.titleLabel.frame));
NSLog(@"---------------------"); CGFloat buttonWidth = 52;
CGFloat textWidth = 40;
CGFloat imageWidth = 19;
CGFloat imageHeight = 19;
[_focusedBtn setImage:[UIImage imageNamed:@"focusBtn"] forState:UIControlStateNormal]; // 关注后这个图片改变了
[_focusedBtn setBackgroundImage:[UIImage imageNamed:@"redcolor"] forState:UIControlStateNormal];
[_focusedBtn setContentHorizontalAlignment:UIControlContentHorizontalAlignmentLeft];
[_focusedBtn setContentVerticalAlignment:UIControlContentVerticalAlignmentTop]; [_focusedBtn setImageEdgeInsets:UIEdgeInsetsMake(6,(buttonWidth-imageWidth)/2, 0, 0 )]; [_focusedBtn.titleLabel setFont:[UIFont systemFontOfSize:12.0f]];
[_focusedBtn.titleLabel setContentMode:UIViewContentModeCenter];
_focusedBtn.titleLabel.textAlignment = NSTextAlignmentCenter;
[_focusedBtn.titleLabel sizeToFit];
// 我尝试在label宽度基础上加上一个字符宽度。只要字符不超过一定长度,显示就没有问题,这个调整具体问题具体分析
[_focusedBtn setTitleEdgeInsets:UIEdgeInsetsMake(imageHeight + 10 ,- _focusedBtn.titleLabel.bounds.size.width/2 + 7, 9,0)]; NSLog(@"buttuon:%@",NSStringFromCGRect(_focusedBtn.frame));
NSLog(@"imageView:%@",NSStringFromCGRect(_focusedBtn.imageView.frame));
NSLog(@"textLabel:%@",NSStringFromCGRect(_focusedBtn.titleLabel.frame)); [self.view addSubview:_focusedBtn];
}

总结: 这个UIButton的内部控件的自定义,位置调整最重要。

- 1、首先要改变内部控件的对其方式,`setContentHorizontalAlignment` `setContentVerticalAlignment`
- 2、然后重新设置每个子控件的内部间距,这个设置要注意,如果要实现比较好的效果,需要精细调整。
- 3、其实主要是理解`UIEdgeInsets`的使用。`UIEdgeInsets`内部包含四个值{top,left,bottom,right},每个值都是以自身位置为标准进行偏移。比如top,为正数时向下偏移,负数向上偏移。所以对子控件进行布局时一定要明确最初所处的位置。
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