iOS 开发UidatePicker 改变字体颜色的方法

 

小编在开发的过程中，遇到这一需求，实在是让我头疼半天，因为UIdatePicker 没有更改字体的属性设置，当时找遍了百度上的很多方法，都不是很靠谱，最后通过朋友了解到runtime的相关知识，于是将这一问题解决，好了废话少，马上为您，奉上代码。

以下是在.h文件中的声明

#import <UIKit/UIKit.h>

@protocol XG_datePickerDelegate <NSObject>

@optional

-(void)chooseDateString:(NSString*)dateString;

@end

@interface DataPcikerView : UIView

@property (nonatomic, assign) id<XG_datePickerDelegate> delegate;

@end

以下实在.m当中的实现

#import "DataPcikerView.h"

#import <objc/runtime.h>

#define kUIColor(a,b,c) [UIColor colorWithRed:a/255.0 green:b/255.0 blue:c/255.0 alpha:1]

#define WIDTH [UIScreen mainScreen].bounds.size.width

#define HEIGHT [UIScreen mainScreen].bounds.size.height

#define buttonW 50

#define buttonH 40

#define spaceX 10

@implementation DataPcikerView

{

    NSString * _dateString;

    UIDatePicker *picker;

}

/*

// Only override drawRect: if you perform custom drawing.

// An empty implementation adversely affects performance during animation.

- (void)drawRect:(CGRect)rect {

    // Drawing code

}

*/

-(instancetype)initWithFrame:(CGRect)frame

{

    if (self = [super initWithFrame:frame]) {

         self .backgroundColor= kUIColor(56, 62, 72);

        [self createUI];

    }

    return self;

}

-(void)createUI

{

        //日期

    picker=[[UIDatePicker alloc] initWithFrame:CGRectMake(0,40, WIDTH,self.frame.size.height*3/4)];

    //设置白色字体

    unsigned int outCount;

    int i;

    objc_property_t *pProperty = class_copyPropertyList([UIDatePicker class], &outCount);

    for (i = outCount -1; i >= 0; i--)

    {

        //         循环获取属性的名字   property_getName函数返回一个属性的名称

        NSString *getPropertyName = [NSString stringWithCString:property_getName(pProperty[i]) encoding:NSUTF8StringEncoding];

        NSString *getPropertyNameString = [NSString stringWithCString:property_getAttributes(pProperty[i]) encoding:NSUTF8StringEncoding];

        if([getPropertyName isEqualToString:@"textColor"])

        {

            [picker setValue:[UIColor whiteColor] forKey:@"textColor"];

        }

        

        NSLog(@"%@====%@",getPropertyNameString,getPropertyName);

        

    }

    SEL selector = NSSelectorFromString(@"setHighlightsToday:");

    NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDatePicker instanceMethodSignatureForSelector:selector]];

    BOOL no = NO;

    [invocation setSelector:selector];

    [invocation setArgument:&no atIndex:2];

    [invocation invokeWithTarget:picker];

    

    picker.backgroundColor= kUIColor(56, 62, 72);

    //        picker.backgroundColor=kUIColor(238, 88, 39);

    //    picker.backgroundColor= deepBgColor;

    //    picker.layer.borderColor=[kUIColor(238, 238,238) CGColor];

    //    picker.layer.borderWidth=1;

    [picker addTarget:self action:@selector(dateChange:) forControlEvents:UIControlEventValueChanged];

    NSLocale *locale=[[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"];

    picker.locale=locale;

    NSDate *localDate=[NSDate date];

    NSCalendar *gregorion=[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

    NSDateComponents *offsetComponents=[[NSDateComponents alloc] init];

    //设置时间

    [offsetComponents setYear:0];

    [offsetComponents setMonth:0];

    [offsetComponents setDay:0];

    //设置最大的时间

    NSDate *maxDate=[gregorion dateByAddingComponents:offsetComponents toDate:localDate options:0];

    picker.maximumDate=maxDate;

    //设置日期的显示格式

    picker.datePickerMode=UIDatePickerModeDate;

    [self addSubview:picker];

    

    UIButton *btn=[UIButton buttonWithType:UIButtonTypeCustom];

    [btn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];

    btn.frame = CGRectMake(WIDTH - buttonW - spaceX,0, buttonW, buttonH);

    [btn setTitle:@"确定" forState:UIControlStateNormal];

    [btn addTarget:self action:@selector(dateBtn:) forControlEvents:UIControlEventTouchUpInside];

    [self addSubview:btn];

    UIButton *btn1=[UIButton buttonWithType:UIButtonTypeCustom];

    [btn1 setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];

    btn1.frame = CGRectMake(spaceX,0, buttonW, buttonH);

    [btn1 setTitle:@"取消" forState:UIControlStateNormal];

    [btn1 addTarget:self action:@selector(dissMissDate) forControlEvents:UIControlEventTouchUpInside];

    [self addSubview:btn1];

    

}

-(void)dissMissDate

{

    [UIView animateWithDuration:1 animations:^{

        self.frame = CGRectMake(0, HEIGHT, WIDTH, self.frame.size.height);

    } completion:^(BOOL finished) {

        [self removeFromSuperview];

    }];

}

-(void)dateBtn:(UIButton*)btn

{

    if (_dateString.length>0) {

        if ([self.delegate respondsToSelector:@selector(chooseDateString:)]) {

            [self.delegate chooseDateString:_dateString];

        }

    }

}

-(void)dateChange:(UIDatePicker *)pick

{

    NSDate *pickDate=[pick date];

    NSDateFormatter *pickerFormatter=[[NSDateFormatter alloc] init];

    [pickerFormatter setDateFormat:@"yyyy-MM-dd"];

    NSString *dataStr=[pickerFormatter stringFromDate:pickDate];

    NSLog(@"----------dataStr-------%@",dataStr);

   

    _dateString = dataStr;

}

以上代码 是我对UIDatePicker 文件的封装 以及PickerView 字体的改变方法

以下这一段代码 利用了runtime进行时 进行改变

   //  1、objc_property_t获取所有方法的list,

 objc_property_t *pProperty = class_copyPropertyList([UIDatePicker class], &outCount);

    for (i = outCount -1; i >= 0; i--)

    {

        //        2 循环获取属性的名字   property_getName函数返回一个属性的名称

        NSString *getPropertyName = [NSString stringWithCString:property_getName(pProperty[i]) encoding:NSUTF8StringEncoding];

        NSString *getPropertyNameString = [NSStringstringWithCString:property_getAttributes(pProperty[i]) encoding:NSUTF8StringEncoding];

 //        3、 查找到textcolor的方法  设置这个方法的value值

        if([getPropertyName isEqualToString:@"textColor"])

        {

            [picker setValue:[UIColor whiteColor] forKey:@"textColor"];

        }

        

        NSLog(@"%@====%@",getPropertyNameString,getPropertyName);

    }

 //        3、 查找到@"setHighlightsToday:" 的方法  设置这个方法的value值 

    SEL  selector =  NSSelectorFromString ( @"setHighlightsToday:" );

    NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDatePickerinstanceMethodSignatureForSelector:selector]];

    BOOL no = NO;

    [invocation setSelector:selector];

    [invocation setArgument:&no atIndex:2];// 这个方法要从这里设置参数的Index 需要从2开始，因为前两个被selector和target占用

    [invocation invokeWithTarget:picker];// 设好的参数 以及方法 赋值 给pickerView