高度自定义的 iOS 单选按钮：DLRadioButton

#import "DLRadioButton.h"    // programmatically add buttons    // first button  DLRadioButton *firstRadioButton = [[DLRadioButton alloc] initWithFrame:CGRectMake(30, 200, 200, 30)];  firstRadioButton.buttonSideLength = 30;  [firstRadioButton setTitle:@"Red Button" forState:UIControlStateNormal];  [firstRadioButton setTitleColor:[UIColor redColor] forState:UIControlStateNormal];  firstRadioButton.circleColor = [UIColor redColor];  firstRadioButton.indicatorColor = [UIColor redColor];  firstRadioButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;    // add other buttons  [self.view addSubview:firstRadioButton];  NSArray *colorNames = @[@"Orange", @"Green", @"Cyon", @"Blue", @"Purple"];  NSArray *buttonColors = @[[UIColor orangeColor], [UIColor greenColor], [UIColor cyanColor], [UIColor blueColor], [UIColor purpleColor]];  NSInteger i = 0;  NSMutableArray *otherButtons = [NSMutableArray new];  for (UIColor *buttonColor in buttonColors) {      // customize this button      DLRadioButton *radioButton = [[DLRadioButton alloc] initWithFrame:CGRectMake(30, 240+40*i, 200, 30)];      radioButton.buttonSideLength = 30;      [radioButton setTitle:[colorNames[i] stringByAppendingString:@" Button"] forState:UIControlStateNormal];      [radioButton setTitleColor:buttonColor forState:UIControlStateNormal];      radioButton.circleColor = buttonColor;      radioButton.indicatorColor = buttonColor;      radioButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;      [otherButtons addObject:radioButton];      [self.view addSubview:radioButton];      i++;  }  firstRadioButton.otherButtons = otherButtons;