控件篇

iOS UI编程技巧

最新推荐文章于 2024-12-10 14:33:07 发布

Beelin_9527

最新推荐文章于 2024-12-10 14:33:07 发布

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本文链接：https://blog.youkuaiyun.com/MantisPerrin/article/details/52711227

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本文介绍了一系列iOS开发中UI实现的技巧，包括自定义按钮样式、调整UILabel行间距、使用UIImageView播放GIF动画、获取WebView内容高度及导航栏的半透明效果设置等。

textFrild

placeholder颜色

[self.pwd setValue:[UIColor colorWithWhite:1 alpha:.5] forKeyPath:@"_placeholderLabel.textColor"];

空字符不可点击

enablesReturnKeyAutomatically

label

行距

NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:labelText];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
[paragraphStyle setLineSpacing:LINESPACE];//调整行间距
[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [labelText length])];
label.attributedText = attributedString;

UIImageView

gif图片

imv.animationImages = images;
imv.animationDuration = 0.25;
[imv startAnimating];

Button

图上字下

#import "buttonCustom.h"
#define KimageW 30
#define KtitleH 21
#define Kpadding 10
@interface buttonCustom()

@end

@implementation buttonCustom

- (instancetype)initWithFrame:(CGRect)frame{
    if (self = [super initWithFrame:frame]) {
        self.titleLabel.textAlignment = NSTextAlignmentCenter;
    }
    return self;
}

//set title
- (void)setTitle:(NSString *)title forState:(UIControlState)state{
    [super setTitle:title forState:state];
   
}

//set image
- (void)setImage:(UIImage *)image forState:(UIControlState)state
{
    [super setImage:image forState:state];
    
}


//custom title rect
- (CGRect)titleRectForContentRect:(CGRect)contentRect{
    return CGRectMake(0 , Kpadding *2 , self.bounds.size.width, 21 );
}

//custom image rect
- (CGRect)imageRectForContentRect:(CGRect)contentRect{
    return CGRectMake(0 , Kpadding ,self.bounds.size.width , KimageW);
}
@end

webView

获取高度 document.body.scrollHeight （注意先必须webview宽度）

导航栏

self.navigationController.navigationBar.translucent = YES;半透明

self.view由（0，0）开始

self.edgesForExtendedLayout = UIRectEdgeTop;
self.extendedLayoutIncludesOpaqueBars = YES;
self.automaticallyAdjustsScrollViewInsets = NO;

布局控件
宽间隙 =  
 ((屏幕宽 - (控件宽 * 宽个数)) / (宽个数 + 1))
控件X = 
宽间隙 * ((i % 宽个数) +1) + 控件宽 * (i %宽个数);
控件Y = 高间隙* ((i /宽个数) +1)
 + 控件高* (i /宽个数);