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];

}

}