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一:首先查看一下关于UIButton的定义
@class UIImage, UIFont, UIColor, UIImageView, UILabel; //设置UIButton的样式 typedef NS_ENUM(NSInteger, UIButtonType) { UIButtonTypeCustom = 0, // 自定义,无风格 UIButtonTypeSystem NS_ENUM_AVAILABLE_IOS(7_0), // standard system button UIButtonTypeDetailDisclosure, //蓝色的披露按钮,可放在任何文字旁 UIButtonTypeInfoLight, //微件(widget)使用的小圆圈信息按钮,可以放在任何文字旁 UIButtonTypeInfoDark, //白色背景下使用的深色圆圈信息按钮 UIButtonTypeContactAdd, //蓝色加号(+)按钮,可以放在任何文字旁 UIButtonTypeRoundedRect = UIButtonTypeSystem, // 白色圆角矩形,类似偏好设置表格单元或者地址簿卡片 }; NS_CLASS_AVAILABLE_IOS(2_0) @interface UIButton : UIControl <NSCoding> + (instancetype)buttonWithType:(UIButtonType)buttonType; @property(nonatomic) UIEdgeInsets contentEdgeInsets UI_APPEARANCE_SELECTOR; // 默认值 UIEdgeInsetsZero 所有按钮的内容周围的矩形的内侧或者外侧的边缘 @property(nonatomic) UIEdgeInsets titleEdgeInsets; // 默认值UIEdgeInsetsZero 设置文字的EdgeInsets 在按钮标题文本周围矩形的,向内或者向外的边缘 @property(nonatomic) BOOL reversesTitleShadowWhenHighlighted; // 默认值NO.当按钮高亮时,是否更改标题阴影 @property(nonatomic) UIEdgeInsets imageEdgeInsets; // 默认值 UIEdgeInsetsZero 设置UIButton上的图标间距 属于按钮图片周围矩形的,向内或者向外的边缘 @property(nonatomic) BOOL adjustsImageWhenHighlighted; // 默认值为YES.默认情况下,在按钮被禁用时,图像会被画的颜色深一些。要禁用此功能,请将这个属性设置为NO: @property(nonatomic) BOOL adjustsImageWhenDisabled; // 默认值为YES.默认情况下,按钮在被禁用时,图像会被画的颜色淡一些。要禁用此功能,请将这个属性设置为NO: @property(nonatomic) BOOL showsTouchWhenHighlighted; // 默认值为 NO. 这个属性设置为YES,可令按钮在按下时发光 @property(null_resettable, nonatomic,strong) UIColor *tintColor NS_AVAILABLE_IOS(5_0); // The tintColor is inherited through the superview hierarchy. See UIView for more information. //获取当前UIButton的UIButtonType 只读 @property(nonatomic,readonly) UIButtonType buttonType; //常见的设置属性效果 - (void)setTitle:(nullable NSString *)title forState:(UIControlState)state; - (void)setTitleColor:(nullable UIColor *)color forState:(UIControlState)state UI_APPEARANCE_SELECTOR; - (void)setTitleShadowColor:(nullable UIColor *)color forState:(UIControlState)state UI_APPEARANCE_SELECTOR; - (void)setImage:(nullable UIImage *)image forState:(UIControlState)state; - (void)setBackgroundImage:(nullable UIImage *)image forState:(UIControlState)state UI_APPEARANCE_SELECTOR; - (void)setAttributedTitle:(nullable NSAttributedString *)title forState:(UIControlState)state NS_AVAILABLE_IOS(6_0); // default is nil. title is assumed to be single line - (nullable NSString *)titleForState:(UIControlState)state; - (nullable UIColor *)titleColorForState:(UIControlState)state; - (nullable UIColor *)titleShadowColorForState:(UIControlState)state; - (nullable UIImage *)imageForState:(UIControlState)state; - (nullable UIImage *)backgroundImageForState:(UIControlState)state; - (nullable NSAttributedString *)attributedTitleForState:(UIControlState)state NS_AVAILABLE_IOS(6_0); //获取当前UIButton的一些属性值 都为只读 @property(nullable, nonatomic,readonly,strong) NSString *currentTitle; // normal/highlighted/selected/disabled. can return nil @property(nonatomic,readonly,strong) UIColor *currentTitleColor; // normal/highlighted/selected/disabled. always returns non-nil. default is white(1,1) @property(nullable, nonatomic,readonly,strong) UIColor *currentTitleShadowColor; // normal/highlighted/selected/disabled. @property(nullable, nonatomic,readonly,strong) UIImage *currentImage; // normal/highlighted/selected/disabled. can return nil @property(nullable, nonatomic,readonly,strong) UIImage *currentBackgroundImage; // normal/highlighted/selected/disabled. can return nil @property(nullable, nonatomic,readonly,strong) NSAttributedString *currentAttributedTitle NS_AVAILABLE_IOS(6_0); // normal/highlighted/selected/disabled. can return nil @property(nullable, nonatomic,readonly,strong) UILabel *titleLabel NS_AVAILABLE_IOS(3_0); @property(nullable, nonatomic,readonly,strong) UIImageView *imageView NS_AVAILABLE_IOS(3_0); //指定背景边界 - (CGRect)backgroundRectForBounds:(CGRect)bounds; //指定内容边界 - (CGRect)contentRectForBounds:(CGRect)bounds; //指定文字标题边界 - (CGRect)titleRectForContentRect:(CGRect)contentRect; //指定按钮图像边界 - (CGRect)imageRectForContentRect:(CGRect)contentRect; @end
UIButton是继承于UIControl,并且也遵循NSCoding的协议;
知识点1:关于UIControlState的Enum值
enum{ UIControlStateNormal = 0,//常态 UIControlStateHighlighted = 1 << 0,//高亮 UIControlStateDisabled = 1 << 1,//禁用 UIControlStateSelected = 1 << 2,//选中 UIControlStateApplication = 0x00FF0000,//当应用程序标志使用时 UIControlStateReserved = 0xFF000000//为内部框架预留的 }; typedef NSUInteger UIControlState;
知识点2:contentHorizontalAlignment;可以设置UIButton文字的对齐方式,contentHorizontalAlignment并不是UIButton的属性,而是它父类UIControl的一个属性;
typedef NS_ENUM(NSInteger, UIControlContentHorizontalAlignment) { UIControlContentHorizontalAlignmentCenter = 0, UIControlContentHorizontalAlignmentLeft = 1, UIControlContentHorizontalAlignmentRight = 2, UIControlContentHorizontalAlignmentFill = 3, };
知识点3:forControlEvents参数类型
typedef NS_OPTIONS(NSUInteger, UIControlEvents) { UIControlEventTouchDown = 1 << 0,//单点触摸按下事件:用户点触屏幕,或者又有新手指落下的时候。 UIControlEventTouchDownRepeat = 1 << 1,//多点触摸按下事件,点触计数大于1:用户按下第二、三、或第四根手指的时候。 UIControlEventTouchDragInside = 1 << 2,//当一次触摸在控件窗口内拖动时。 UIControlEventTouchDragOutside = 1 << 3,//当一次触摸在控件窗口之外拖动时。 UIControlEventTouchDragEnter = 1 << 4,//当一次触摸从控件窗口之外拖动到内部时 UIControlEventTouchDragExit = 1 << 5,//当一次触摸从控件窗口内部拖动到外部时。 UIControlEventTouchUpInside = 1 << 6,//所有在控件之内触摸抬起事件 UIControlEventTouchUpOutside = 1 << 7,//所有在控件之外触摸抬起事件(点触必须开始与控件内部才会发送通知)。 UIControlEventTouchCancel = 1 << 8,//所有触摸取消事件,即一次触摸因为放上了太多手指而被取消,或者被上锁或者电话呼叫打断。 UIControlEventValueChanged = 1 << 12,//当控件的值发生改变时,发送通知。用于滑块、分段控件、以及其他取值的控件。你可以配置滑块控件何时发送通知,在滑块被放下时发送,或者在被拖动时发送。 UIControlEventEditingDidBegin = 1 << 16,//当文本控件中开始编辑时发送通知 UIControlEventEditingChanged = 1 << 17,//当文本控件中的文本被改变时发送通知。 UIControlEventEditingDidEnd = 1 << 18,//当文本控件中编辑结束时发送通知。 UIControlEventEditingDidEndOnExit = 1 << 19,//当文本控件内通过按下回车键(或等价行为)结束编辑时,发送通知。 UIControlEventAllTouchEvents = 0x00000FFF,//通知所有触摸事件。 UIControlEventAllEditingEvents = 0x000F0000,//通知所有关于文本编辑的事件。 UIControlEventApplicationReserved = 0x0F000000,//range available for application use UIControlEventSystemReserved = 0xF0000000,//range reserved for internal framework use UIControlEventAllEvents = 0xFFFFFFFF//通知所有事件 };
二:首先查看一下关于UILabel 的定义
@class UIColor, UIFont; NS_CLASS_AVAILABLE_IOS(2_0) @interface UILabel : UIView <NSCoding> @property(nullable, nonatomic,copy) NSString *text; // 设置文本内容 @property(null_resettable, nonatomic,strong) UIFont *font; // 设置文本字体,默认是系统17 @property(null_resettable, nonatomic,strong) UIColor *textColor; // 设置文本色 @property(nullable, nonatomic,strong) UIColor *shadowColor; // 设置文本的阴影 @property(nonatomic) CGSize shadowOffset; // 默认值CGSizeMake(0, -1) @property(nonatomic) NSTextAlignment textAlignment; // 默认值 NSTextAlignmentLeft 文字位置排版 @property(nonatomic) NSLineBreakMode lineBreakMode; // default is NSLineBreakByTruncatingTail. used for single and multiple lines of text // 富文本属性 @property(nullable, nonatomic,copy) NSAttributedString *attributedText NS_AVAILABLE_IOS(6_0); // 默认值 nil @property(nullable, nonatomic,strong) UIColor *highlightedTextColor; // 默认值 nil @property(nonatomic,getter=isHighlighted) BOOL highlighted; // 默认值 NO @property(nonatomic,getter=isUserInteractionEnabled) BOOL userInteractionEnabled; // 默认值为 NO 所以它没有点击事件效果 @property(nonatomic,getter=isEnabled) BOOL enabled; // 默认值为YES. //行数 0表示不限制 @property(nonatomic) NSInteger numberOfLines; @property(nonatomic) BOOL adjustsFontSizeToFitWidth; // 默认值为 NO 文字的大小是否根据宽度来自动调整 @property(nonatomic) UIBaselineAdjustment baselineAdjustment; // default is UIBaselineAdjustmentAlignBaselines @property(nonatomic) CGFloat minimumScaleFactor NS_AVAILABLE_IOS(6_0); // default is 0.0 @property(nonatomic) BOOL allowsDefaultTighteningForTruncation NS_AVAILABLE_IOS(9_0); // default is NO //重写UILabel布局 - (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines; - (void)drawTextInRect:(CGRect)rect; //这个属性是用来设置多行label的最大宽度的 //当自动布局的时候约束这个label的时候这个属性会起作用 //在自动布局添加约束中,若文本超过了指定的最大宽度的时候 文本会另起一行 从而增加了label的高度 @property(nonatomic) CGFloat preferredMaxLayoutWidth NS_AVAILABLE_IOS(6_0); // IOS7以后就弃用 @property(nonatomic) CGFloat minimumFontSize NS_DEPRECATED_IOS(2_0, 6_0); // deprecated - use minimumScaleFactor. default is 0.0 // IOS7以后就弃用 @property(nonatomic) BOOL adjustsLetterSpacingToFitWidth NS_DEPRECATED_IOS(6_0,7_0); @end
UILabel是继承于UIView,并且也遵循NSCoding的协议;
知识点1:枚举类型 默认是NSLineBreakByTruncatingTail
NSLineBreakByWordWrapping = 0, 按着一个单词来显示 不会被剪辑剩余的不会被显示 NSLineBreakByCharWrapping, 按着一个字体来显示 不会被剪辑剩余的不会被显示 NSLineBreakByClipping, 把能显示的全显示完 剩下的直接不显示可能有的字显示一半就被剪辑 NSLineBreakByTruncatingHead, 在那一行显示不全的话 那一行 就以 ...abcd模式来显示 NSLineBreakByTruncatingTail, 在那一行显示不全的话 那一行 就以 abcd...模式来显示 NSLineBreakByTruncatingMiddle 在那一行显示不全的话那一行 就以 ab...cd模式来显示
知识点2:textAlignment是设置label的对齐方式是一个枚举,默认是左对齐
NSTextAlignmentLeft=0 左对齐 NSTextAlignmentCenter=1 居中 NSTextAlignmentRight=2 右对齐 NSTextAlignmentJustified=3 左右两边都对齐 一个段落的最后一行是natural-aligned NSTextAlignmentNatural=4 显示脚本的默认对齐方式
知识点3:全部NSMutableAttributedString属性
NSFontAttributeName; //字体,value是UIFont对象 NSParagraphStyleAttributeName; //绘图的风格(居中,换行模式,间距等诸多风格),value是NSParagraphStyle对象 NSForegroundColorAttributeName; // 文字颜色,value是UIFont对象 NSBackgroundColorAttributeName; // 背景色,value是UIFont NSLigatureAttributeName; // 字符连体,value是NSNumber NSKernAttributeName; // 字符间隔 NSStrikethroughStyleAttributeName; //删除线,value是NSNumber NSUnderlineStyleAttributeName; //下划线,value是NSNumber NSStrokeColorAttributeName; //描绘边颜色,value是UIColor NSStrokeWidthAttributeName; //描边宽度,value是NSNumber NSShadowAttributeName; //阴影,value是NSShadow对象 NSTextEffectAttributeName; //文字效果,value是NSString NSAttachmentAttributeName; //附属,value是NSTextAttachment 对象 NSLinkAttributeName; //链接,value是NSURL or NSString NSBaselineOffsetAttributeName; //基础偏移量,value是NSNumber对象 NSUnderlineColorAttributeName; //下划线颜色,value是UIColor对象 NSStrikethroughColorAttributeName; //删除线颜色,value是UIColor NSObliquenessAttributeName; //字体倾斜 NSExpansionAttributeName; //字体扁平化 NSVerticalGlyphFormAttributeName; //垂直或者水平,value是 NSNumber,0表示水平,1垂直
实例运用:
/************************************************某区域内************************************************************/ NSMutableAttributedString *string = [[NSMutableAttributedString alloc]initWithString:@"0元"]; [string setAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:14]} range:NSMakeRange(string.length-1, 1)]; etlbl.attributedText = string; /************************************************基本用法************************************************************/ NSString *content = @"内容太多,需要自适应才能解决问题,所以需要写这个扩展类,内容太多,需要自适应才能解决问题,所以需要写这个扩展类"; NSMutableAttributedString *string = [[NSMutableAttributedString alloc]initWithString:content]; //字体大小 [string addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:10] range:NSMakeRange(0, 1)]; //字体颜色 [string addAttribute:NSForegroundColorAttributeName value:[UIColor yellowColor] range:NSMakeRange(1, 1)]; //字体背景颜色 [string addAttribute:NSBackgroundColorAttributeName value:[UIColor purpleColor] range:NSMakeRange(2, 1)]; //添加下划线 [string addAttribute:NSUnderlineStyleAttributeName value:@(NSUnderlineStyleSingle) range:NSMakeRange(3, 1)]; //添加下划线颜色 [string addAttribute:NSUnderlineColorAttributeName value:[UIColor redColor] range:NSMakeRange(3, 1)]; UILabel *etlbl3 = [[UILabel alloc]initWithFrame:CGRectMake(100, 400, 200, 30)]; etlbl3.attributedText = string; [self.view addSubview:etlbl3];
知识点4:iOS的UILabel设置居上对齐,居中对齐,居下对齐
在iOS中默认的UILabel中的文字在竖直方向上只能居中对齐,从UILabel继承了一个新类,实现了居上对齐,居中对齐,居下对齐。
#import <UIKit/UIKit.h> typedef enum { VerticalAlignmentTop = 0, // default VerticalAlignmentMiddle, VerticalAlignmentBottom, } VerticalAlignment; @interface myUILabel : UILabel { @private VerticalAlignment _verticalAlignment; } @property (nonatomic) VerticalAlignment verticalAlignment; @end
#import "myUILabel.h" @implementation myUILabel @synthesize verticalAlignment = verticalAlignment_; - (id)initWithFrame:(CGRect)frame { if (self = [super initWithFrame:frame]) { self.verticalAlignment = VerticalAlignmentMiddle; } return self; } - (void)setVerticalAlignment:(VerticalAlignment)verticalAlignment { verticalAlignment_ = verticalAlignment; [self setNeedsDisplay]; } - (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines { CGRect textRect = [super textRectForBounds:bounds limitedToNumberOfLines:numberOfLines]; switch (self.verticalAlignment) { case VerticalAlignmentTop: textRect.origin.y = bounds.origin.y; break; case VerticalAlignmentBottom: textRect.origin.y = bounds.origin.y + bounds.size.height - textRect.size.height; break; case VerticalAlignmentMiddle: // Fall through. default: textRect.origin.y = bounds.origin.y + (bounds.size.height - textRect.size.height) / 2.0; } return textRect; } -(void)drawTextInRect:(CGRect)requestedRect { CGRect actualRect = [self textRectForBounds:requestedRect limitedToNumberOfLines:self.numberOfLines]; [super drawTextInRect:actualRect]; } @end
运用(实现左上的效果):
lbl_mylabel = [[myUILabel alloc] initWithFrame:CGRectMake(20, 50, 150, 600)]; UIColor *color = [UIColor colorWithPatternImage:[UIImage imageNamed:@"halfTransparent.png"]];//使用半透明图片作为label的背景色 lbl_mylabel.backgroundColor = color; lbl_mylabel.textAlignment = UITextAlignmentLeft; lbl_mylabel.textColor = UIColor.whiteColor; lbl_mylabel.lineBreakMode = UILineBreakModeWordWrap; lbl_mylabel.numberOfLines = 0; [lbl_mylabel setVerticalAlignment:VerticalAlignmentTop]; [self addSubview:lbl_mylabel];
上面的实例就是针对下面两个方法的运用:
- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines; - (void)drawTextInRect:(CGRect)rect;
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原文地址:http://www.cnblogs.com/LiLihongqiang/p/5820524.html