IOS之代理文字点击变大变小

重点是掌握代理的使用，否则也失去次此意义

#import "ViewController.h"
#import "AHLJFontSizePicker.h"
#define kScreenW [UIScreen mainScreen].bounds.size.width
@interface ViewController ()<AHLJFontSizePickerDelegate>
@property (weak, nonatomic) IBOutlet UILabel *lbl;
@end
@implementation ViewController
- (void)viewDidLoad {[super viewDidLoad];AHLJFontSizePicker *pickView = [[AHLJFontSizePicker alloc] initWithFrame:CGRectZero];pickView.delegate = self;pickView.frame = CGRectMake(0, 150, kScreenW, 80);pickView.backgroundColor = UIColor.systemTealColor;[self.view addSubview:pickView];}
- (void)fontSizePickerDidBtnClick:(AHLJFontSizePicker *)picker didSetFontSize:(FontSizeEnum)fontSize{switch (fontSize) {case FontSizeSmall:self.lbl.font = [UIFont systemFontOfSize:11 weight:UIFontWeightBold];break;case FontSizeMiddle:self.lbl.font = [UIFont systemFontOfSize:15 weight:UIFontWeightBold];break;case FontSizeBig:self.lbl.font = [UIFont systemFontOfSize:18 weight:UIFontWeightBold];break;case FontSizeSuperBig:self.lbl.font = [UIFont systemFontOfSize:22 weight:UIFontWeightBold];break;default:break;}}
@end

//
//  AHLJFontSizePicker.h
//  图片点击文字变大或者变小
//
//  Created by lujun on 2021/10/20.
//#import <UIKit/UIKit.h>
@class AHLJFontSizePicker;
typedef enum {FontSizeSmall = 0,FontSizeMiddle = 1,FontSizeBig = 2,FontSizeSuperBig = 3}FontSizeEnum;
NS_ASSUME_NONNULL_BEGIN
@protocol AHLJFontSizePickerDelegate <NSObject>
-(void)fontSizePickerDidBtnClick:(AHLJFontSizePicker *)picker didSetFontSize:(FontSizeEnum)fontSize;
@end
@interface AHLJFontSizePicker : UIView
@property(nonatomic,weak)id<AHLJFontSizePickerDelegate> delegate;
@end
NS_ASSUME_NONNULL_END

#define kBtnCount 4
#import "AHLJFontSizePicker.h"
#define btnH1 30
#define  btnY1 5
#define btnW1 self.frame.size.width / btnCount
@interface AHLJFontSizeButton : UIButton
@end
@implementation AHLJFontSizeButton
- (instancetype)initWithFrame:(CGRect)frame{self = [super initWithFrame:frame];if(self){self.adjustsImageWhenHighlighted  = NO;self.imageView.contentMode = UIViewContentModeScaleAspectFit;}return  self;
}
- (void)setHighlighted:(BOOL)highlighted{}
@end
@interface AHLJFontSizePicker()
@property(nonatomic,weak)AHLJFontSizeButton *selectedButton;
@property(nonatomic,weak)UIImageView *topLine;
@property(nonatomic,weak)UIImageView *bottomLine;
@property(nonatomic,weak)UIImageView *slider;
@end
@implementation AHLJFontSizePicker
- (UIImageView *)topLine{if(!_topLine){UIImageView *topLineImg = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"正文字号-滑条红"]];_topLine = topLineImg;[self addSubview:_topLine];}return _topLine;
}
- (void)drawRect:(CGRect)rect{[super drawRect:rect];CGFloat sW = [UIScreen mainScreen].bounds.size.width;CGFloat btnW = sW / kBtnCount;CGFloat btnY = 5;CGFloat btnH = 30;NSArray *arrNor = @[@"正文字号-小（默认）",@"正文字号-中（默认）",@"正文字号-大（默认）",@"正文字号-大+（默认）"];NSArray *arrSel = @[@"正文字号-小",@"正文字号-中",@"正文字号-大",@"正文字号-大+"];for(int i=0;i<kBtnCount;i++){AHLJFontSizeButton *btn = [[AHLJFontSizeButton alloc] initWithFrame:CGRectMake(i * btnW, btnY, btnW, btnH)];[btn setImage:[UIImage imageNamed:arrNor[i]] forState:UIControlStateNormal];[btn setImage:[UIImage imageNamed:arrSel[i]] forState:UIControlStateSelected];btn.tag = i;[self addSubview:btn];[btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];}AHLJFontSizeButton *firstBtn = (AHLJFontSizeButton *)self.subviews.firstObject;AHLJFontSizeButton *lastBtn = (AHLJFontSizeButton *)self.subviews.lastObject;UIImageView *slider = [[UIImageView alloc] initWithImage: [UIImage imageNamed:@"正文字号-滑块"]];[self addSubview:slider];self.slider = slider;UIImageView *bottomLine = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"正文字号-滑条"]];CGFloat bottomLineX = firstBtn.center.x - slider.frame.size.width*0.5;CGFloat bottomLineMaxX = lastBtn.center.x + slider.frame.size.width*0.5;CGFloat bottomY = 35 + 15;bottomLine.frame = CGRectMake(bottomLineX,bottomY , bottomLineMaxX - bottomLineX, 3);[self addSubview:bottomLine];self.bottomLine = bottomLine;slider.center = CGPointMake( firstBtn.center.x, bottomLine.center.y);[self btnClick:firstBtn];
}
-(void)btnClick:(AHLJFontSizeButton *)btn{self.selectedButton.selected = NO;btn.selected = YES;self.selectedButton = btn;self.slider.center =CGPointMake(self.selectedButton.center.x, self.bottomLine.center.y);self.topLine.frame = CGRectMake(self.bottomLine.frame.origin.x, self.bottomLine.frame.origin.y, self.slider.center.x-self.slider.frame.size.width-7, 3);if([self.delegate respondsToSelector:@selector(fontSizePickerDidBtnClick:didSetFontSize:)]){[self.delegate fontSizePickerDidBtnClick:self didSetFontSize:(int)btn.tag];}
}
@end

https://e.coding.net/lujun1/wangyecebianlan/IOSSmallPictureAndBig.git

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IOS之代理文字点击变大变小

IOS之代理文字点击变大变小

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