7、UIStepper
//计数器控件 固定宽高
UIStepper * stepper = [[UIStepper alloc] initWithFrame:CGRectMake(100, 100, 0, 0)];
[self.view addSubview:stepper];
stepper.value = 30;
stepper.minimumValue = 10;
stepper.maximumValue = 50;
stepper.stepValue = 2;
stepper.continuous = NO;
//临界是否继续输出,min <-> max
stepper.wraps = YES;
stepper.tintColor = [UIColor redColor];
//点住按钮是否自动增加计数
stepper.autorepeat = YES;
[stepper addTarget:self action:@selector(stepAction:) forControlEvents:UIControlEventValueChanged];
}
- (void)stepAction:(UIStepper *)stepper {
NSLog(@"%lf",stepper.value);
self.stepperLabel.font = [UIFont systemFontOfSize:stepper.value];
}