級別：★★☆☆☆
標籤：「UIButton」「UIControlEvents」
作者： WYW
大家好，今天小編帶大家研究一下UIButton裡 各種UIControlEvents的具體區別。
首先，我們先看下蘋果官方對UIControlEvents的定義。
UIControlEvents 相關位移列舉
typedef NS_OPTIONS(NSUInteger, UIControlEvents) {
UIControlEventTouchDown = 1 << 0, // on all touch downs
UIControlEventTouchDownRepeat = 1 << 1, // on multiple touchdowns (tap count > 1)
UIControlEventTouchDragInside = 1 << 2,
UIControlEventTouchDragOutside = 1 << 3,
UIControlEventTouchDragEnter = 1 << 4,
UIControlEventTouchDragExit = 1 << 5,
UIControlEventTouchUpInside = 1 << 6,
UIControlEventTouchUpOutside = 1 << 7,
UIControlEventTouchCancel = 1 << 8,
UIControlEventValueChanged = 1 << 12, // sliders, etc.
UIControlEventPrimaryActionTriggered NS_ENUM_AVAILABLE_IOS(9_0) = 1 << 13, // semantic action: for buttons, etc.
UIControlEventEditingDidBegin = 1 << 16, // UITextField
UIControlEventEditingChanged = 1 << 17,
UIControlEventEditingDidEnd = 1 << 18,
UIControlEventEditingDidEndOnExit = 1 << 19, // 'return key' ending editing
UIControlEventAllTouchEvents = 0x00000FFF, // for touch events
UIControlEventAllEditingEvents = 0x000F0000, // for UITextField
UIControlEventApplicationReserved = 0x0F000000, // range available for application use
UIControlEventSystemReserved = 0xF0000000, // range reserved for internal framework use
UIControlEventAllEvents = 0xFFFFFFFF // 相當於上邊的所有值的 或
};
複製程式碼UIControlEvents的具體解釋
-
UIControlEventTouchDown
官方：A touch-down event in the control.
解釋：觸下control 中的事件(這個可以用於監測 剛剛按下按鈕 或者是UISlider的時候的事件) -
UIControlEventTouchDownRepeat
官方：A repeated touch-down event in the control; for this event the value of the UITouch tapCount method is greater than one.
解釋：在control上重複地按下的事件 這個事件的tap數量大於1 -
UIControlEventTouchDragInside
官方：An event where a finger is dragged inside the bounds of the control.
解釋：手指在control的bounds範圍內拖動的的事件 -
UIControlEventTouchDragOutside
官方：An event where a finger is dragged just outside the bounds of the control.
解釋：當手指拖動剛好在control的bounds 範圍外的事件 -
UIControlEventTouchDragEnter
官方：An event where a finger is dragged into the bounds of the control.
解釋：當手指拖動進入control範圍內的事件 -
UIControlEventTouchDragExit
官方：An event where a finger is dragged from within a control to outside its bounds.
解釋：當手指從control範圍內到它的bounds外的時候的事件 -
UIControlEventTouchUpInside
官方：A touch-up event in the control where the finger is inside the bounds of the control.
解釋：手指在在control內部 觸發的touch-up事件(經常給按鈕新增這個事件) -
UIControlEventTouchUpOutside
官方：A touch-up event in the control where the finger is outside the bounds of the control.
解釋：手指在在control外部 觸發的touch-up事件 -
UIControlEventTouchCancel
官方：A system event canceling the current touches for the control.
解釋：一種系統事件 取消control當前觸控的事件 -
UIControlEventValueChanged
官方：A touch dragging or otherwise manipulating a control, causing it to emit a series of different values.
解釋：拖動觸控 或 其他操作一個control引起這個control顯示一系列不同的值(像UISlider在拖動的時候值的變化可以通過這個事件來監測) -
UIControlEventPrimaryActionTriggered
官方：A semantic action triggered by buttons.
解釋：按鈕觸發的語義動作? 這個沒用過 -
UIControlEventEditingDidBegin
官方：A touch initiating an editing session in a UITextField object by entering its bounds.
解釋：當觸控UITextField物件後 通過進入它的bounds 初始化一個編輯會話 -
UIControlEventEditingChanged
官方：A touch making an editing change in a UITextField object.
解釋：觸控UITextField物件後一個編輯改變 -
UIControlEventEditingDidEnd
官方：A touch ending an editing session in a UITextField object by leaving its bounds.
解釋：在手指離開TextFiled物件的bounds的時候 觸控結束的一個編輯會話 -
UIControlEventEditingDidEndOnExit
官方：A touch ending an editing session in a UITextField object.
解釋：在UITextField物件中 觸控結束編輯會話 -
UIControlEventAllTouchEvents
官方：All touch events.
解釋：所有的觸控事件 -
UIControlEventAllEditingEvents
官方：All editing touches for UITextField objects.
解釋： 對於UITextFiled物件的所有的的編輯觸控 -
UIControlEventApplicationReserved
官方：A range of control-event values available for application use.
解釋： 為應用使用的預留的 一系列可用的的control-event值 -
UIControlEventSystemReserved
官方：A range of control-event values reserved for internal framework use.
解釋： 為內部framework預留的 一系列control-event values -
UIControlEventAllEvents
官方：All events, including system events.
解釋：所有的事件 包括系統事件
Demo研究：
思路： 設計了5個按鈕 用不同方式新增事件處理（控制變數法）
- 第一個Button：建立按鈕新增事件，並且新增事件處理，點選按鈕後方法正常執行;
- 第二個Button：控制
target為nil，點選按鈕後方法正常執行，在響應鏈上找一個物件響應訊息; - 第三個Button：控制
action為null或者是 方法寫錯名字 會崩潰unrecognized selector sent to instance 0x7fef757063e0'; - 第四個Button：給按鈕新增 事件
UIControlEventAllEvents； - 第五個Button： 復位按鈕 當前功能是設定
kDisplaceStep = 0;
Demo通過遍歷UIControlEvents 位移列舉，找出按鈕新增了那些方法。
編譯器Demo截圖：
相關程式碼
#import "QiButton_UIControlEventsViewController.h"
static NSUInteger kDisplaceStep = 0; //!< 偏移位數
static long long const kDisplacementBase = 0x01; //!< 偏移基數
@implementation QiButton_UIControlEventsViewController {
NSDictionary *_controlEventDictionary; //!< UIControlEvents 列舉字典
}
- (void)viewDidLoad {
[super viewDidLoad];
self.title = @"UIControlEvents";
self.view.backgroundColor = [UIColor whiteColor];
[self prepareData];
[self controlEventsDemo];
}
#pragma mark - private functions
- (void)prepareData {
_controlEventDictionary = @{
@(UIControlEventTouchDown) : @"UIControlEventTouchDown",
@(UIControlEventTouchDownRepeat) : @"UIControlEventTouchDownRepeat",
@(UIControlEventTouchDragInside) : @"UIControlEventTouchDragInside",
@(UIControlEventTouchDragOutside) : @"UIControlEventTouchDragOutside",
@(UIControlEventTouchDragEnter) : @"UIControlEventTouchDragEnter",
@(UIControlEventTouchDragExit) : @"UIControlEventTouchDragExit",
@(UIControlEventTouchUpInside) : @"UIControlEventTouchUpInside",
@(UIControlEventTouchUpOutside) : @"UIControlEventTouchUpOutside",
@(UIControlEventTouchCancel) : @"UIControlEventTouchCancel",
@(UIControlEventValueChanged) : @"UIControlEventValueChanged",
@(UIControlEventPrimaryActionTriggered) : @"UIControlEventPrimaryActionTriggered",
@(UIControlEventEditingDidBegin):@"UIControlEventEditingDidBegin",
@(UIControlEventEditingChanged) : @"UIControlEventEditingChanged",
@(UIControlEventEditingDidEnd):@"UIControlEventEditingDidEnd",
@(UIControlEventEditingDidEndOnExit):@"UIControlEventEditingDidEndOnExit",
@(UIControlEventAllTouchEvents):@"UIControlEventAllTouchEvents",
@(UIControlEventAllEditingEvents):@"UIControlEventAllEditingEvents",
@(UIControlEventApplicationReserved):@"UIControlEventApplicationReserved",
@(UIControlEventSystemReserved):@"UIControlEventSystemReserved",
@(UIControlEventAllEvents):@"UIControlEventAllEvents",
};
}
- (void)controlEventsDemo {
// - (void)addTarget:(id)target action:(SEL)action forControlEvents:(UIControlEvents)controlEvents;
/**
* Demo思路 建立5個按鈕 並且新增事件處理
* 1. 中規中矩建立按鈕新增事件 並且新增事件處理 點選按鈕後 方法正常執行
* 2. target 設定為nil 點選按鈕後方法正常執行 在響應鏈上找一個物件響應訊息
* 3. action 設定為null 或者是 方法寫錯名字 會崩潰 unrecognized selector sent to instance 0x7fef757063e0'
* 4. 給按鈕新增 事件 UIControlEventAllEvents
* 5. 復位按鈕 當前功能是設定 kDisplaceStep = 0;
檢視效果：
* 6. 讀者可以試著改變UIControlEvents 位移列舉 輸出為按鈕新增的UIControlEvents的內容
* 其中還有別的內容像 UITextField 像 UISlider 中的一些事件處理
*/
self.edgesForExtendedLayout = UIRectEdgeNone;
CGFloat screenH = [UIScreen mainScreen].bounds.size.height;
CGFloat screenW = [UIScreen mainScreen].bounds.size.width;
if (screenH == 812.0 && screenW == 375.0) {
screenH -= 122.0;
}else {
screenH -= 64.0;
}
CGFloat btnTopMargin = 20.0;
CGFloat btnW = [UIScreen mainScreen].bounds.size.width;
CGFloat btnH = (screenH - (btnTopMargin * 5)) / 5;
UIButton *normalBtn = [[UIButton alloc] initWithFrame:CGRectMake(.0, btnTopMargin, btnW, btnH)];
[self.view addSubview:normalBtn];
[normalBtn setTitle:@"normalButton" forState:UIControlStateNormal];
normalBtn.backgroundColor = [UIColor lightGrayColor];
[normalBtn addTarget:self action:@selector(normalButtonClicked:) forControlEvents:UIControlEventTouchDown];
[normalBtn addTarget:self action:@selector(normalButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
UIButton *targetNilBtn = [[UIButton alloc] initWithFrame:CGRectMake(.0, (btnTopMargin * 2 + btnH), btnW, btnH)];
[self.view addSubview:targetNilBtn];
[targetNilBtn setTitle:@"targetNilButton" forState:UIControlStateNormal];
targetNilBtn.backgroundColor = [UIColor grayColor];
[targetNilBtn addTarget:nil action:@selector(targetNilButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
[targetNilBtn addTarget:nil action:@selector(targetNilButtonClicked:) forControlEvents:UIControlEventTouchDown];
UIButton *selectorNullBtn = [[UIButton alloc] initWithFrame:CGRectMake(.0, (btnTopMargin * 3 + btnH * 2), btnW, btnH)];
[self.view addSubview:selectorNullBtn];
[selectorNullBtn setTitle:@"null Selector Button" forState:UIControlStateNormal];
selectorNullBtn.backgroundColor = [UIColor darkGrayColor];
[selectorNullBtn addTarget:self action:@selector(null) forControlEvents:UIControlEventTouchUpInside];
UIButton *allEventsBtn = [[UIButton alloc] initWithFrame:CGRectMake(.0, (btnTopMargin * 4 + btnH * 3), btnW, btnH)];
[self.view addSubview:allEventsBtn];
[allEventsBtn setTitle:@"allEventsButton" forState:UIControlStateNormal];
allEventsBtn.backgroundColor = [[UIColor darkTextColor] colorWithAlphaComponent:0.6];
[allEventsBtn addTarget:self action:@selector(allEventButtonClicked:) forControlEvents:UIControlEventAllEvents];
UIButton *resetBtn = [[UIButton alloc] initWithFrame:CGRectMake(.0, (btnTopMargin * 5 + btnH * 4), btnW, btnH)];
[self.view addSubview:resetBtn];
[resetBtn setTitle:@"復位" forState:UIControlStateNormal];
resetBtn.backgroundColor = [[UIColor darkTextColor] colorWithAlphaComponent:0.8];
[resetBtn addTarget:self action:@selector(resetButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
}
#pragma mark - action functions
- (void)normalButtonClicked:(UIButton *)sender {
UIControlEvents tempEvents = sender.allControlEvents;
for (; kDisplaceStep < 32; ++ kDisplaceStep) {
if (tempEvents & (kDisplacementBase << kDisplaceStep)) {
NSLog(@"新增的allControlEvents:%lu",(unsigned long)sender.allControlEvents);
NSLog(@"分別為: %llu--%@", (kDisplacementBase << kDisplaceStep),_controlEventDictionary[@(kDisplacementBase << kDisplaceStep)]); // %o %x
// 65 相當於 UIControlEventTouchDown | UIControlEventTouchUpInside
}
}
NSLog(@"%s",__FUNCTION__);
}
- (void)targetNilButtonClicked:(UIButton *)sender {
NSLog(@"新增的allControlEvents:%lu",(unsigned long)sender.allControlEvents);
NSLog(@"%s",__FUNCTION__);
// 呼叫次數為2 是因為測試的UIControlEventTouchDown 和 UIControlEventTouchUpInside 各呼叫了一次
}
- (void)allEventButtonClicked:(UIButton *)sender {
UIControlEvents tempEvents = sender.allControlEvents;
for (; kDisplaceStep < 32; ++ kDisplaceStep) {
if (tempEvents & (kDisplacementBase << kDisplaceStep)) {
NSLog(@"新增的allControlEvents:%lu",(unsigned long)sender.allControlEvents);
NSLog(@"可能有: %llu--%@", (kDisplacementBase << kDisplaceStep),_controlEventDictionary[@(kDisplacementBase << kDisplaceStep)]); // %o %x
}
}
// 其輸出結果代表其可以響應很多事件，這種情況下就不能夠準確的確定是那個事件了， 因為可能是彼此之間二進位制位重複的值 做的 或 操作後的結果。
NSLog(@"%s",__FUNCTION__);
}
- (void)resetButtonClicked:(UIButton *)sender {
NSLog(@"%s",__FUNCTION__);
kDisplaceStep = 0;
}
@end
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