1、cell多选删除
效果图：
02-FZHDeleteCells.gif
1)、创建每个功能的按钮
OC：
- (void)setupNavigationItem{
UIBarButtonItem *editBtn = [[UIBarButtonItem alloc]initWithTitle:@"编辑" style:UIBarButtonItemStyleDone target:self action:@selector(buttonDidTouch:)];
UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc]initWithTitle:@"完成" style:UIBarButtonItemStyleDone target:self action:@selector(buttonDidTouch:)];
UIBarButtonItem *deleteBtn = [[UIBarButtonItem alloc]initWithTitle:@"删除" style:UIBarButtonItemStyleDone target:self action:@selector(buttonDidTouch:)];
UIBarButtonItem *selectAllBtn = [[UIBarButtonItem alloc]initWithTitle:@"全选" style:UIBarButtonItemStyleDone target:self action:@selector(buttonDidTouch:)];
editBtn.tag = 1001;
doneBtn.tag = 1002;
deleteBtn.tag = 1003;
self.navigationItem.leftBarButtonItems = @[editBtn,doneBtn,deleteBtn,selectAllBtn];
}
swift：
func setupNavigationBar() -> Void {
let editButton = UIBarButtonItem.init(title: "编辑", style: .Done, target: self, action: #selector(buttonDidTouch))
let doneButton = UIBarButtonItem.init(title: "完成", style: .Done, target: self, action: #selector(buttonDidTouch))
let deleteButton = UIBarButtonItem.init(title: "删除", style: .Done, target: self, action: #selector(buttonDidTouch))
let selectAllButton = UIBarButtonItem.init(title: "全选", style: .Done, target: self, action: #selector(buttonDidTouch))
editButton.tag = 1001
doneButton.tag = 1002
deleteButton.tag = 1003
self.navigationItem.leftBarButtonItems = [editButton,doneButton,deleteButton,selectAllButton]
}
2)、每个按钮的响应事件
OC：
- (void)buttonDidTouch:(UIButton *)btn{
if (btn.tag == 1001) {//edit
self.tableView.editing = YES;
self.tableView.allowsMultipleSelectionDuringEditing = YES;
}else if (btn.tag == 1002){//done
self.tableView.editing = NO;
}else if (btn.tag == 1003){//delete
[self.dataSource removeObjectsInArray:self.deleteArray];
[self.tableView reloadData];
}else{
if (self.tableView.editing == NO) {
return;
}else{
for (int i = 0; i < self.dataSource.count; i++) {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
[self.tableView selectRowAtIndexPath:indexPath animated:YES scrollPosition:UITableViewScrollPositionNone];
}
[self.deleteArray addObjectsFromArray:self.dataSource];
}
}
}
swift：
func buttonDidTouch(btn:UIButton) -> Void {
if btn.tag == 1001 {//编辑
tableView.editing = true
tableView.allowsMultipleSelectionDuringEditing = true
}else if btn.tag == 1002{//完成
tableView.editing = false
}else if btn.tag == 1003{//删除
self.dataSource.removeObjectsInArray(self.deleteArr as [AnyObject])
tableView.reloadData()
}else{//全选
if tableView.editing == false {//如果处于完成状态则直接返回
return
}
for row in 0...self.dataSource.count {
let indexPath = NSIndexPath.init(forRow: row, inSection: 0)
tableView.selectRowAtIndexPath(indexPath, animated: false, scrollPosition: .None)
}
self.deleteArr.addObjectsFromArray(self.dataSource as [AnyObject])
}
}
3)、实现按钮功能的tableView相关协议的方法
OC：
#pragma mark - UITableViewDelegate
//选中
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
[self.deleteArray addObject:self.dataSource[indexPath.row]];
}
//取消选中
- (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath{
[self.deleteArray removeObject:self.dataSource[indexPath.row]];
}
- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath{
return UITableViewCellEditingStyleDelete|UITableViewCellEditingStyleInsert;
}
swift：
// 设置编辑style
func tableView(tableView: UITableView, editingStyleForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCellEditingStyle {
return UITableViewCellEditingStyle.init(rawValue: UITableViewCellEditingStyle.Delete.rawValue | UITableViewCellEditingStyle.Insert.rawValue)!
}
// 选中则添加到删除数组中
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
self.deleteArr.addObject(self.dataSource[indexPath.row])
}
// 取消选中在数组中删除
func tableView(tableView: UITableView, didDeselectRowAtIndexPath indexPath: NSIndexPath) {
self.deleteArr.removeObject(self.dataSource[indexPath.row])
}
2、swift声明extension
extension SomeType {
// 为 SomeType 添加的新功能写到这里
}
eg:
//该extension为UIColor添加了一个输出`i am a color`的方法
extension UIcolor{
fun printFun{
print("i am a color")
}
}
2.1、解析Hex color的UIColor的Extension
OC:
+ (UIColor *)colorWithHexString:(NSString *)color alpha:(CGFloat)alpha
{
//删除字符串中的空格
NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
// String should be 6 or 8 characters
if ([cString length] < 6)
{
return [UIColor clearColor];
}
// strip 0X if it appears
//如果是0x开头的，那么截取字符串，字符串从索引为2的位置开始，一直到末尾
if ([cString hasPrefix:@"0X"])
{
cString = [cString substringFromIndex:2];
}
//如果是#开头的，那么截取字符串，字符串从索引为1的位置开始，一直到末尾
if ([cString hasPrefix:@"#"])
{
cString = [cString substringFromIndex:1];
}
if ([cString length] != 6)
{
return [UIColor clearColor];
}
// Separate into r, g, b substrings
NSRange range;
range.location = 0;
range.length = 2;
//r
NSString *rString = [cString substringWithRange:range];
//g
range.location = 2;
NSString *gString = [cString substringWithRange:range];
//b
range.location = 4;
NSString *bString = [cString substringWithRange:range];
// Scan values
unsigned int r, g, b;
[[NSScanner scannerWithString:rString] scanHexInt:&r];
[[NSScanner scannerWithString:gString] scanHexInt:&g];
[[NSScanner scannerWithString:bString] scanHexInt:&b];
return [UIColor colorWithRed:((float)r / 255.0f) green:((float)g / 255.0f) blue:((float)b / 255.0f) alpha:alpha];
}
//默认alpha值为1
+ (UIColor *)colorWithHexString:(NSString *)color
{
return [self colorWithHexString:color alpha:1.0f];
}
// Create a color using a hex RGB value
// ex. [UIColor colorWithHexValue: 0x03047F]
+ (UIColor *) colorWithHexValue: (NSInteger) rgbValue {
return [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0
green:((float)((rgbValue & 0xFF00) >> 8))/255.0
blue:((float)(rgbValue & 0xFF))/255.0
alpha:1.0];
}
swift:
extension UIColor{
class func colorWithHexString(color: String,alpha: CGFloat) -> UIColor {
var colorStr = color.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet()).uppercaseString
let length = colorStr.lengthOfBytesUsingEncoding(NSUTF8StringEncoding)
// let length = (colorStr as NSString).length
if length < 6 {
return UIColor.clearColor()
}
if colorStr.hasPrefix("0X") {
let index = colorStr.startIndex.advancedBy(2)
colorStr = colorStr.substringFromIndex(index)
}
if colorStr.hasPrefix("#") {
let index = colorStr.startIndex.advancedBy(1)
colorStr = colorStr.substringFromIndex(index)
}
// red
// myString.startIndex.advancedBy(1)..<myString.startIndex.advancedBy(4)
let redRange = colorStr.startIndex...colorStr.startIndex.advancedBy(1)
let redStr = colorStr.substringWithRange(redRange)
// green
let greenRange = colorStr.startIndex.advancedBy(2)...colorStr.startIndex.advancedBy(3)
let greenStr = colorStr.substringWithRange(greenRange)
// blue
let blueRange = colorStr.startIndex.advancedBy(4)...colorStr.startIndex.advancedBy(5)
let blueStr = colorStr.substringWithRange(blueRange)
var r: UInt32 = 1
var g: UInt32 = 1
var b: UInt32 = 1
NSScanner.init(string: redStr).scanHexInt(&r)
NSScanner.init(string: greenStr).scanHexInt(&g)
NSScanner.init(string: blueStr).scanHexInt(&b)
return UIColor.init(red: CGFloat(r)/255.0, green: CGFloat(g)/255.0, blue: CGFloat(b)/255.0, alpha: alpha)
}
class func colorWithHexString(color: String) -> UIColor {
return self.colorWithHexString(color, alpha: 1.0)
}
}
3、swift截取字符串
var myString = "abcde"
let myRange = myString.startIndex.advancedBy(1)..<myString.startIndex.advancedBy(4) // 1..<4
myString.substringWithRange(myRange) // "bcd"
myString = "a😀cde"
let myRange2 = myString.startIndex.advancedBy(1)..<myString.startIndex.advancedBy(4) // 1..<5
myString.substringWithRange(myRange2) // "😀cd"
4、NSNumber转NSString
NSString *myString = [NSNumber stringValue];
DEMO地址：https://github.com/fengzhihao123/CommonKnowledgeSummary
PS:今天Wings夺得TI6冠军，毕竟偶数年。CN Dota，Best Dota！！！
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