ios中addtarget的用法
1.addtarget 的。部分使用事件没有直接的操作方式，需要进行调用。就要用addTarget。
- (void)setupCustomView {
self.customView = [[CHView alloc] init];
self.customView.translatesAutoresizingMaskIntoConstraints = NO;
[self.view addSubview:self.customView];
NSDictionary *viewsDictionary = @{ @"topLayoutGuide": self.topLayoutGuide,
@"customView": self.customView
};
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[topLayoutGuide][customView]|"
options:0
metrics:nil
views:viewsDictionary]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[customView]|"
options:0
metrics:nil
views:viewsDictionary]];
[self setupSliders];
[self updateColors];
[self setupTargetActions];
}
- (void)setupSliders {
self.customView.trackWidthSlider.maximumValue = 100.0;
self.customView.gaugeWidthSlider.maximumValue = 100.0;
self.customView.valueSlider.value = self.customView.gauge.value;
self.customView.trackWidthSlider.value = self.customView.gauge.trackWidth;
self.customView.gaugeWidthSlider.value = self.customView.gauge.gaugeWidth;
self.customView.valueSliderLabel.text = [self formattedStringForFloatValue:(self.customView.gauge.value * 100)];
self.customView.trackWidthSliderLabel.text = [self formattedStringForFloatValue:self.customView.gauge.trackWidth];
self.customView.gaugeWidthSliderLabel.text = [self formattedStringForFloatValue:self.customView.gauge.gaugeWidth];
self.customView.valueSlider.continuous = NO;
self.customView.trackWidthSlider.continuous = NO;
self.customView.gaugeWidthSlider.continuous = NO;
}
- (void)updateColors {
self.customView.valueColorIndicatorView.backgroundColor = self.customView.gauge.textColor;
self.customView.trackColorIndicatorView.backgroundColor = self.customView.gauge.trackTintColor;
self.customView.gaugeColorIndicatorView.backgroundColor = self.customView.gauge.gaugeTintColor;
}
- (void)setupTargetActions {
UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(changeState:)];
[self.customView.gauge addGestureRecognizer:tapGestureRecognizer];
[self.customView.gaugeStyleSwitch addTarget:self action:@selector(changeGuageStyle:) forControlEvents:UIControlEventValueChanged];
[self.customView.valueSlider addTarget:self action:@selector(valueSliderChangedValue:) forControlEvents:UIControlEventValueChanged];
[self.customView.trackWidthSlider addTarget:self action:@selector(trackWidthSliderChangedValue:) forControlEvents:UIControlEventValueChanged];
[self.customView.gaugeWidthSlider addTarget:self action:@selector(gaugeWidthSliderChangedValue:) forControlEvents:UIControlEventValueChanged];
tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(changeValueColor:)];
[self.customView.valueColorIndicatorView addGestureRecognizer:tapGestureRecognizer];
tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(changeTrackColor:)];
[self.customView.trackColorIndicatorView addGestureRecognizer:tapGestureRecognizer];
tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(changeGaugeColor:)];
[self.customView.gaugeColorIndicatorView addGestureRecognizer:tapGestureRecognizer];
}
#pragma mark - Action Methods
- (void)changeState:(UITapGestureRecognizer *)tapGestureRecognizer {
if (self.customView.gauge.state != CHCircleGaugeViewStateNA) {
self.customView.gauge.state = CHCircleGaugeViewStateNA;
} else {
[self.customView.gauge setValue:self.customView.gauge.value animated:YES];
}
}