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1：增加手势进行左划效果，针对视图并修改其中一个的坐标，菜单用隐藏跟显示
@property(strong,nonatomic)UISwipeGestureRecognizer *recognizer;
self.recognizer = [[ UISwipeGestureRecognizer alloc ] initWithTarget:self action:@selector (handleSwipeFrom:)]; [self.recognizer setDirection:(UISwipeGestureRecognizerDirectionLeft)]; [self addGestureRecognizer :self.recognizer];
- (void)handleSwipeFrom:( UISwipeGestureRecognizer *)sender{if (sender.direction == UISwipeGestureRecognizerDirectionLeft )
{
self.rightButton.hidden=NO;
[self.recognizer setDirection:(UISwipeGestureRecognizerDirectionRight)];
[self.valueLabel mas_remakeConstraints:^(MASConstraintMaker *make) {
make.right.mas_equalTo(self.rightButton.left).with.offset(-5);
make.centerY.mas_equalTo(self).with.offset(0);
make.size.mas_equalTo(CGSizeMake(Main_Screen_Width-180, 15));
}];
[self.valueLabel layoutIfNeeded];
}
else
{
self.rightButton.hidden=YES;
[self.recognizer setDirection:(UISwipeGestureRecognizerDirectionLeft)];
[self.valueLabel mas_remakeConstraints:^(MASConstraintMaker *make) {
make.right.mas_equalTo(self.right).with.offset(-15);
make.centerY.mas_equalTo(self).with.offset(0);
make.size.mas_equalTo(CGSizeMake(Main_Screen_Width-180, 15));
}];
[self.valueLabel layoutIfNeeded];
}
}
2:属性名以new开头解决方式
@property (nonatomic,copy) NSString *new_Passwd;
像上面这样写法会报错，可以替换成
@property (nonatomic,copy,getter = theNewPasswd) NSString *new_Passwd;
3：单例类一些注意事项
如果allocWithZone里面的代码不写，用以下三种创建的实例还是三种，不符合我们对单例的运用，当然如果你只针对[HLTestObject sharedInstance]进行实例化时，就是一直满足；把初始化的属性对象放在sharedInstance里面，如果放在init里面进行初始化也会出现不一样的情景；
HLTestObject *objct1 = [HLTestObject sharedInstance]; NSLog(@"%@",objct1); HLTestObject *objc2 = [[HLTestObject alloc] init]; NSLog(@"%@",objc2); HLTestObject *objc3 = [HLTestObject new]; NSLog(@"%@",objc3);
声明属性：
@property (assign, nonatomic) int height; @property (strong, nonatomic) NSObject *object; @property (strong, nonatomic) NSMutableArray *arrayM;
代码内容：
static HLTestObject *instance = nil;
+ (instancetype)sharedInstance
{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
instance = [[[self class] alloc] init];
instance.height = 10;
instance.object = [[NSObject alloc] init];
instance.arrayM = [[NSMutableArray alloc] init];
});
return instance;
}
+ (instancetype)allocWithZone:(struct _NSZone *)zone
{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
instance = [super allocWithZone:zone];
});
return instance;
}
- (NSString *)description
{
NSString *result = @"";
result = [result stringByAppendingFormat:@"<%@: %p>",[self class], self];
result = [result stringByAppendingFormat:@" height = %d,",self.height];
result = [result stringByAppendingFormat:@" arrayM = %p,",self.arrayM];
result = [result stringByAppendingFormat:@" object = %p,",self.object];
return result;
}
4:UITextField实现左侧空出一定的边距
就是通过uitextfield的leftview来实现的，同时要设置leftviewmode。
如果设置左右边距，需要再加上rightView功能
-(void)setTextFieldLeftPadding:(UITextField *)textField forWidth:(CGFloat)leftWidth
{
CGRect frame = textField.frame;
frame.size.width = leftWidth;
UIView *leftview = [[UIView alloc] initWithFrame:frame];
textField.leftViewMode = UITextFieldViewModeAlways;
textField.leftView = leftview;
}
5:UICollectionView异步加载的实例
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
static NSString * CellIdentifier = @"Event";
EventCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath];
Event *event = [events objectAtIndex:indexPath.item]; // replace "Event" with whatever class you use for your items实体
cell.eventTitle.text = [event objectForKey:@"title"];
cell.eventImage.image = [event objectForKey:@"image"];
if (cell.eventImage.image == nil) {
NSString *imageUrl = [[[events objectAtIndex:indexPath.item] objectForKey:@"photo"] objectForKey:@"url"];
dispatch_queue_t imageFetchQ = dispatch_queue_create("image fetched", NULL);
dispatch_async(imageFetchQ, ^{
__weak UICollectionView *weakCollection;
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:imageUrl]];
UIImage *image = [UIImage imageWithData:imageData];
if (image)
{
dispatch_async(dispatch_get_main_queue(), ^{
[event setObject:image forKey:@"image"]; // updating the model here
[weakCollection reloadItemsAtIndexPaths:@[indexPath]];
});
}
});
}
return cell;
}
6：如何拿到别人APP图片
a：打开你Mac上的iTunes，点击我的应用, 找到刚下载好的应用, 右击在finder中显示
b：按Enter(回车键), 修改微信ipa文件的后缀为.zip, 即把微信 6.3.22.ipa变成微信 6.3.22.zip, 此处会有一个提示, 问你是否确定修改扩展名, 点击使用.zip即可
c：直接双击zip进行解压, 打开解压好的文件夹, 进入Payload文件夹 此时, 就拿到了大多数的资源. 包括css, js, 图片, MP3/4, 字体,xib等等资源
d：取Assets.car中的资源 （工具下载地址: http://pan.baidu.com/s/1kUVAT7p 提取密码: qrt5）
e：我们在上面的E步骤所在的文件夹处搜索Assets.car即可 直接将Assets.car拖入其中即可, 对, 拖进去就行了，点击start, 完成后, 点击Output Dir即可（ iOS APP中所有资源 = Assets.car + .api文件解压）
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原文地址：http://www.cnblogs.com/LiLihongqiang/p/5810130.html
