新建一个Category,命名为UIColor+Hex,表示UIColor支持十六进制Hex颜色设置。
UIColor+Hex.h文件,
#import <UIKit/UIKit.h>#define RGBA_COLOR(R, G, B, A) [UIColor colorWithRed:((R) / 255.0f) green:((G) / 255.0f) blue:((B) / 255.0f) alpha:A]#define RGB_COLOR(R, G, B) [UIColor colorWithRed:((R) / 255.0f) green:((G) / 255.0f) blue:((B) / 255.0f) alpha:1.0f]@interface UIColor (Hex)+ (UIColor *)colorWithHexString:(NSString *)color;//从十六进制字符串获取颜色,//color:支持@“#123456”、 @“0X123456”、 @“123456”三种格式+ (UIColor *)colorWithHexString:(NSString *)color alpha:(CGFloat)alpha;@end
上面的代码在开头是两个宏定义,就是对[UIColor colorWithRed:green:blue:alpha]方法的简化,在UIColor(Hex)中声明两个方法-colorWithHexString和-colorWithHexString:alpha,这个很好理解。
UIColor+Hex.m文件
#import "UIColor+Hex.h"@implementation UIColor (Hex)+ (UIColor *)colorWithHexString:(NSString *)color alpha:(CGFloat)alpha{ //删除字符串中的空格 NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString]; // String should be 6 or 8 characters if ([cString length] < 6) { return [UIColor clearColor]; } // strip 0X if it appears //如果是0x开头的,那么截取字符串,字符串从索引为2的位置开始,一直到末尾 if ([cString hasPrefix:@"0X"]) { cString = [cString substringFromIndex:2]; } //如果是#开头的,那么截取字符串,字符串从索引为1的位置开始,一直到末尾 if ([cString hasPrefix:@"#"]) { cString = [cString substringFromIndex:1]; } if ([cString length] != 6) { return [UIColor clearColor]; } // Separate into r, g, b substrings NSRange range; range.location = 0; range.length = 2; //r NSString *rString = [cString substringWithRange:range]; //g range.location = 2; NSString *gString = [cString substringWithRange:range]; //b range.location = 4; NSString *bString = [cString substringWithRange:range]; // Scan values unsigned int r, g, b; [[NSScanner scannerWithString:rString] scanHexInt:&r]; [[NSScanner scannerWithString:gString] scanHexInt:&g]; [[NSScanner scannerWithString:bString] scanHexInt:&b]; return [UIColor colorWithRed:((float)r / 255.0f) green:((float)g / 255.0f) blue:((float)b / 255.0f) alpha:alpha];}//默认alpha值为1+ (UIColor *)colorWithHexString:(NSString *)color{ return [self colorWithHexString:color alpha:1.0f];}@end
这样就扩展了UIColor,支持十六进制颜色设置。下面举个栗子,设置UIButton一些颜色特征,来说明该扩展的使用,
#import "UIColor+Hex.h"//省略多余的代码//设置导航栏右侧的BarButtonItem为Button- (void)setupNavigationItem{ UIView *rightView = [[UIView alloc] init]; rightView.bounds = CGRectMake(0, 0, 52, 44); UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeCustom]; rightButton.frame = CGRectMake(-6, 0, 52, 44); rightButton.backgroundImageEdgeInsets = UIEdgeInsetsMake(7, 0, 7, 0); //kSetting是国际化的字符串"设置" [rightButton setTitle:NVSLocalizedString(@"kSetting", nil) forState:UIControlStateNormal]; //使用宏定义的RGB_COLOR// [rightButton setTitleColor:RGB_COLOR(160, 170, 150) forState:UIControlStateHighlighted]; //使用UIColor+Hex扩展 [rightButton setTitleColor:[UIColor colorWithHexString:@"#708c3b"] forState:UIControlStateNormal]; rightButton.titleLabel.font = [UIFont fontWithName:@"Heiti SC" size:12.f]; [rightButton setBackgroundImage:[UIImage imageNamed:@"device_setting_bg"] forState:UIControlStateNormal]; [rightButton setBackgroundImage:[UIImage imageNamed:@"device_setting_bg_press"] forState:UIControlStateHighlighted]; [rightButton addTarget:self action:@selector(settingBtnPresss:) forControlEvents:UIControlEventTouchUpInside]; [rightView addSubview:rightButton]; UIBarButtonItem *rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:rightView]; [self.navigationItem setRightBarButtonItem:rightBarButtonItem animated:YES]; [rightBarButtonItem release]; [rightView release];}
恩,使用差不多就这么简单,总结一下,本篇博客主要有以下几个细节或者说知识点,
(1)宏定义RGB_COLOR和RGBA_COLOR可以设置颜色
(2)UIColor+Hex扩展可以设置颜色
(3)导航栏上面的BarButtonItem怎么设置为Button
(4)Button一些常用和不常用的属性设置
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