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[操作系统]【代码笔记】16进制颜色与UIColor互转


一,效果图

 

二,工程目录。

 

 

三,代码

 

RootViewController.m

 

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- (void)viewDidLoad{  [super viewDidLoad];  // Do any additional setup after loading the view.    //添加背景图  [self addView];}#pragma -mark -functions//添加背景图-(void)addView{  UIView *view=[[UIView alloc]initWithFrame:CGRectMake(50, 100, 200, 200)];  view.backgroundColor=[self colorWithHexString:@"e26562"];  [self.view addSubview:view];}//16进制颜色#e26562与UIColor互转,设置View背景颜色- (UIColor *) colorWithHexString: (NSString *)color{  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  if ([cString hasPrefix:@"0X"])    cString = [cString substringFromIndex:2];  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:1.0f];}
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