分享一些iOS开发实用的小技巧
作者：helloDolin
这篇文章主要给大家分享了一些iOS开发实用的小技巧，这些小技巧在大家开发iOS的时候还是相当实用，有需要的朋友们下面来一起看看吧。
1.设置navigationbar title颜色
UIColor *whiteColor = [UIColor whiteColor]; NSDictionary *dic = [NSDictionary dictionaryWithObject:whiteColor forKey:NSForegroundColorAttributeName]; [self.navigationController.navigationBar setTitleTextAttributes:dic];
2.获取UIColor RGB
UIColor *color = [UIColor colorWithRed:0.0 green:0.0 blue:1.0 alpha:1.0]; const CGFloat *components = CGColorGetComponents(color.CGColor); NSLog(@"Red: %f", components[0]); NSLog(@"Green: %f", components[1]); NSLog(@"Blue: %f", components[2]); NSLog(@"Alpha: %f", components[3]);
3.修改textField的placeholder的字体颜色、大小
[self.textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"]; [self.textField setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@"_placeholderLabel.font"];
4.将color转为UIImage
- (UIImage *)createImageWithColor:(UIColor *)color {
CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);
UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return theImage;
}
5.加载启动图的时候隐藏statusbar
在info.plist中加入Status bar is initially hidden 设置为YES
6.获取按钮title的size
/**
* 获取按钮title的size
*/
- (CGFloat)getBtnTitleWidth:(UIButton*)btn {
CGSize titleSize = [btn.titleLabel.text sizeWithAttributes:@{NSFontAttributeName:btn.titleLabel.font}];
return titleSize;
}
7.设置Status bar颜色
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, -20, ScreenWidth, 20)];[view setBackgroundColor:COLOR_APP_MAIN]; [viewController.navigationController.navigationBar addSubview:view];
8.json转dictionary，dictionary转json
+ (NSString*)dictionaryToJson:(NSDictionary *)dic {
NSError *parseError = nil;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:&parseError];
return [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
}
+(NSDictionary *)jsonToDic:(NSString*)jsonStr {
NSData *jsonData = [jsonStr dataUsingEncoding:NSUTF8StringEncoding];
NSError *err;
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:jsonData
options:NSJSONReadingMutableContainers
error:&err];
return dic;
}
9.是否允许推送
+(BOOL)isAllowedNotification{
if ([[UIDevice currentDevice].systemVersion floatValue] >= 8.0) {
UIUserNotificationSettings *setting = [[UIApplication sharedApplication] currentUserNotificationSettings];
if(UIUserNotificationTypeNone != setting.types) {
return YES;
}
}
NSLog(@"不允许推送");
return NO;
}
10.磁盘空间相关
+ (NSString *)memoryFormatter:(long long)diskSpace {
NSString *formatted;
double bytes = 1.0 * diskSpace;
double megabytes = bytes / MB;
double gigabytes = bytes / GB;
if (gigabytes >= 1.0)
formatted = [NSString stringWithFormat:@"%.2f GB", gigabytes];
else if (megabytes >= 1.0)
formatted = [NSString stringWithFormat:@"%.2f MB", megabytes];
else
formatted = [NSString stringWithFormat:@"%.2f bytes", bytes];
NSLog(@"fotmatted=%@",formatted);
return formatted;
}
+ (NSString *)totalDiskSpace {
long long space = [[[[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:nil] objectForKey:NSFileSystemSize] longLongValue];
return [self memoryFormatter:space];
}
+ (NSString *)freeDiskSpace {
long long freeSpace = [[[[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:nil] objectForKey:NSFileSystemFreeSize] longLongValue];
return [self memoryFormatter:freeSpace];
}
11.修改了leftBarButtonItem如何恢复系统侧滑返回功能
//设置代理
self.interactivePopGestureRecognizer.delegate = self;
#pragma mark - <UIGestureRecognizerDelegate>
//实现代理方法:return YES :手势有效, NO :手势无效
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
//当导航控制器的子控制器个数 大于1 手势才有效
return self.childViewControllers.count > 1;
}
或者用第三方 UINavigationController+FDFullscreenPopGesture
12.使用UIAppearance在某个状态下设置颜色,字体等不好使
只需要在对应的位置用layoutIfNeeded刷新一下就可以了
13.设置圆形图片
/** 设置圆形图片(放到分类中使用) */
- (UIImage *)cutCircleImage {
UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0);
// 获取上下文
CGContextRef ctr = UIGraphicsGetCurrentContext();
// 设置圆形
CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
CGContextAddEllipseInRect(ctr, rect);
// 裁剪
CGContextClip(ctr);
// 将图片画上去
[self drawInRect:rect];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
14.如果在xib中有一个控件, 已经明确设置尺寸了,输出的frame也是对的, 但是显示出来的效果不一样(比如尺寸变大了), 如果是这种情况一般就是autoresizingMask自动伸缩属性在搞鬼!
解决办法如下:
//xib的awakeFromNib方法中设置UIViewAutoresizingNone进行清空
- (void)awakeFromNib {
self.autoresizingMask = UIViewAutoresizingNone;
}
15.通过图片Data数据第一个字节 来获取图片扩展名
- (NSString *)contentTypeForImageData:(NSData *)data {
uint8_t c;
[data getBytes:&c length:1];
switch (c) {
case 0xFF:
return @"jpeg";
case 0x89:
return @"png";
case 0x47:
return @"gif";
case 0x49:
case 0x4D:
return @"tiff";
case 0x52:
if ([data length] < 12) {
return nil;
}
NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(0, 12)] encoding:NSASCIIStringEncoding];
if ([testString hasPrefix:@"RIFF"] && [testString hasSuffix:@"WEBP"]) {
return @"webp";
}
return nil;
}
return nil;
}
16.用0补全的方法
NSInteger count = 5; //02代表:如果count不足2位 用0在最前面补全(2代表总输出的个数) NSString *string = [NSString stringWithFormat:@"%02zd",count]; //输出结果是: 05 NSLog(@"%@", string);
总结
以上就是这篇文章的全部内容，希望本文中的这些小技巧能给大家开发iOS的时候提供一定的帮助，如果有疑问大家可以留言交流。