[控件] LabelView

LabelView

此LabelView是用来将Label显示在固定的View上的,需要计算Label的高度与宽度.

源码:

NSString+StringHeight.h 与 NSString+StringHeight.m

//
//  NSString+StringHeight.h
//  USA
//
//  Created by YouXianMing on 14/12/10.
//  Copyright (c) 2014年 fuhuaqi. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface NSString (StringHeight)

/**
 *  计算文本的高度
 *
 *  @param font  字体
 *  @param width 固定的宽度
 *
 *  @return 高度
 */
- (CGFloat)heightWithLabelFont:(UIFont *)font withLabelWidth:(CGFloat)width;

/**
 *  计算文本的宽度
 *
 *  @param font 字体
 *
 *  @return 宽度
 */
- (CGFloat)widthWithLabelFont:(UIFont *)font;

@end

//
//  NSString+StringHeight.m
//  USA
//
//  Created by YouXianMing on 14/12/10.
//  Copyright (c) 2014年 fuhuaqi. All rights reserved.
//

#import "NSString+StringHeight.h"

@implementation NSString (StringHeight)

- (CGFloat)heightWithLabelFont:(UIFont *)font withLabelWidth:(CGFloat)width {
    CGFloat height = 0;
    
    if (self.length == 0) {
        height = 0;
    } else {

        // 字体
        NSDictionary *attribute = @{NSFontAttributeName: [UIFont systemFontOfSize:18.f]};
        if (font) {
            attribute = @{NSFontAttributeName: font};
        }
        
        // 尺寸
        CGSize retSize = [self boundingRectWithSize:CGSizeMake(width, MAXFLOAT)
                                            options:
                          NSStringDrawingTruncatesLastVisibleLine |
                          NSStringDrawingUsesLineFragmentOrigin |
                          NSStringDrawingUsesFontLeading
                                         attributes:attribute
                                            context:nil].size;
        
        height = retSize.height;
    }
    
    return height;
}

- (CGFloat)widthWithLabelFont:(UIFont *)font {
    CGFloat retHeight = 0;
    
    if (self.length == 0) {
        retHeight = 0;
    } else {
        
        // 字体
        NSDictionary *attribute = @{NSFontAttributeName: [UIFont systemFontOfSize:18.f]};
        if (font) {
            attribute = @{NSFontAttributeName: font};
        }
        
        // 尺寸
        CGSize retSize = [self boundingRectWithSize:CGSizeMake(MAXFLOAT, 0)
                                            options:
                          NSStringDrawingTruncatesLastVisibleLine |
                          NSStringDrawingUsesLineFragmentOrigin |
                          NSStringDrawingUsesFontLeading
                                         attributes:attribute
                                            context:nil].size;
        
        retHeight = retSize.width;
    }
    
    return retHeight;
}

@end

//
//  LabelView.h
//  YXMWeather
//
//  Created by XianMingYou on 15/2/16.
//  Copyright (c) 2015年 XianMingYou. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "NSString+StringHeight.h"

@interface LabelView : UIView

/**
 *  文本
 */
@property (nonatomic, strong) NSString  *text;

/**
 *  文本颜色
 */
@property (nonatomic, strong) UIColor   *textColor;

/**
 *  文本字体
 */
@property (nonatomic, strong) UIFont    *font;

/**
 *  背景色
 */
@property (nonatomic, strong) UIColor   *color;

/**
 *  距离顶部的距离
 */
@property (nonatomic) CGFloat gapFromTop;

/**
 *  距离底部的距离
 */
@property (nonatomic) CGFloat gapFromBottom;

/**
 *  距离左侧的距离
 */
@property (nonatomic) CGFloat gapFromLeft;

/**
 *  距离右侧的距离
 */
@property (nonatomic) CGFloat gapFromRight;

/**
 *  创建出view
 */
- (void)buildView;

/**
 *  创建出默认配置的label
 *
 *  @param text   字符串
 *  @param origin 起始位置
 *
 *  @return 实例对象
 */
+ (instancetype)createWithText:(NSString *)text atOrigin:(CGPoint)origin;

@end

//
//  LabelView.m
//  YXMWeather
//
//  Created by XianMingYou on 15/2/16.
//  Copyright (c) 2015年 XianMingYou. All rights reserved.
//

#import "LabelView.h"

@interface LabelView ()

@property (nonatomic) CGFloat          labelWidth;
@property (nonatomic) CGFloat          labelHeight;

@property (nonatomic, strong) UILabel *label;

@end

@implementation LabelView

- (void)buildView {
    // 设置label
    self.label.text      = self.text;
    self.label.font      = self.font;
    self.label.textColor = self.textColor;
    
    // 获取宽度
    self.labelWidth   = [self.text widthWithLabelFont:self.font];
    self.labelHeight  = [self.text heightWithLabelFont:self.font withLabelWidth:MAXFLOAT];
    self.label.width  = self.labelWidth;
    self.label.height = self.labelHeight;

    // 计算间距
    self.label.x = self.gapFromLeft;
    self.label.y = self.gapFromTop;
    
    // 重新设置尺寸
    self.width  = self.labelWidth + self.gapFromLeft + self.gapFromRight;
    self.height = self.labelHeight + self.gapFromTop + self.gapFromBottom;
    
    // 设置背景色
    if (self.color) {
        self.backgroundColor = self.color;
    }
}

@synthesize label = _label;
- (UILabel *)label {
    if (_label == nil) {
        _label = [[UILabel alloc] initWithFrame:CGRectZero];
        _label.textAlignment = NSTextAlignmentCenter;
        [self addSubview:_label];
    }
    
    return _label;
}

+ (instancetype)createWithText:(NSString *)text atOrigin:(CGPoint)origin {
    LabelView *labelView    = [[LabelView alloc] initWithFrame:CGRectMake(origin.x, origin.y, 0, 0)];
    labelView.color         = [UIColor blackColor];
    labelView.text          = text;
    labelView.textColor     = [UIColor whiteColor];
    labelView.font          = [UIFont fontWithName:LATO_BOLD size:8];
    labelView.gapFromLeft   = 10.f;
    labelView.gapFromRight  = 10.f;
    labelView.gapFromTop    = 2.f;
    labelView.gapFromBottom = 2.f;
    
    [labelView buildView];

    return labelView;
}

@end

使用时候的源码:

    LabelView *labelView = [LabelView createWithText:@"YouXianMing" atOrigin:CGPointMake(10, 90)];

    [self.view addSubview:labelView];